# SPDX-License-Identifier: Apache-2.0 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project import functools import gc import itertools import time from collections import defaultdict from collections.abc import Iterator, Sequence from contextlib import contextmanager from copy import copy, deepcopy from functools import reduce from itertools import product from typing import TYPE_CHECKING, Any, NamedTuple, TypeAlias, cast import numpy as np import torch import torch.distributed import torch.nn as nn from tqdm import tqdm import vllm.envs as envs from vllm.attention.backends.abstract import ( AttentionBackend, AttentionMetadata, AttentionType, MultipleOf, ) from vllm.attention.layer import Attention, MLAAttention from vllm.compilation.counter import compilation_counter from vllm.compilation.cuda_graph import CUDAGraphStat, CUDAGraphWrapper from vllm.compilation.monitor import set_cudagraph_capturing_enabled from vllm.config import ( CompilationMode, CUDAGraphMode, VllmConfig, get_layers_from_vllm_config, update_config, ) from vllm.distributed.ec_transfer import get_ec_transfer, has_ec_transfer from vllm.distributed.eplb.eplb_state import EplbState from vllm.distributed.kv_transfer import get_kv_transfer_group, has_kv_transfer_group from vllm.distributed.kv_transfer.kv_connector.utils import copy_kv_blocks from vllm.distributed.parallel_state import ( get_dcp_group, get_pp_group, get_tp_group, graph_capture, is_global_first_rank, prepare_communication_buffer_for_model, ) from vllm.forward_context import ( BatchDescriptor, set_forward_context, ) from vllm.logger import init_logger from vllm.model_executor.layers.attention_layer_base import AttentionLayerBase from vllm.model_executor.layers.rotary_embedding import ( MRotaryEmbedding, XDRotaryEmbedding, ) from vllm.model_executor.model_loader import TensorizerLoader, get_model_loader from vllm.model_executor.models.interfaces import ( SupportsMRoPE, SupportsMultiModal, SupportsXDRoPE, is_mixture_of_experts, supports_eagle3, supports_mrope, supports_multimodal_pruning, supports_transcription, supports_xdrope, ) from vllm.model_executor.models.interfaces_base import ( VllmModelForPooling, is_pooling_model, is_text_generation_model, ) from vllm.multimodal import MULTIMODAL_REGISTRY from vllm.multimodal.inputs import ( BatchedTensorInputs, MultiModalKwargsItem, PlaceholderRange, ) from vllm.multimodal.utils import group_mm_kwargs_by_modality from vllm.pooling_params import PoolingParams from vllm.sampling_params import SamplingType from vllm.sequence import IntermediateTensors from vllm.tasks import GenerationTask, PoolingTask, SupportedTask from vllm.utils import length_from_prompt_token_ids_or_embeds from vllm.utils.jsontree import json_map_leaves from vllm.utils.math_utils import cdiv, round_up from vllm.utils.mem_constants import GiB_bytes from vllm.utils.mem_utils import DeviceMemoryProfiler from vllm.utils.nvtx_pytorch_hooks import PytHooks from vllm.utils.platform_utils import is_pin_memory_available from vllm.utils.torch_utils import ( get_dtype_size, kv_cache_dtype_str_to_dtype, supports_dynamo, ) from vllm.v1.attention.backends.gdn_attn import GDNAttentionMetadataBuilder from vllm.v1.attention.backends.utils import ( AttentionCGSupport, AttentionMetadataBuilder, CommonAttentionMetadata, create_fast_prefill_custom_backend, get_dcp_local_seq_lens, reorder_batch_to_split_decodes_and_prefills, split_attn_metadata, ) from vllm.v1.cudagraph_dispatcher import CudagraphDispatcher from vllm.v1.kv_cache_interface import ( AttentionSpec, ChunkedLocalAttentionSpec, CrossAttentionSpec, EncoderOnlyAttentionSpec, FullAttentionSpec, KVCacheConfig, KVCacheGroupSpec, KVCacheSpec, MambaSpec, SlidingWindowSpec, UniformTypeKVCacheSpecs, ) from vllm.v1.outputs import ( EMPTY_MODEL_RUNNER_OUTPUT, AsyncModelRunnerOutput, DraftTokenIds, ECConnectorOutput, KVConnectorOutput, LogprobsLists, LogprobsTensors, ModelRunnerOutput, PoolerOutput, SamplerOutput, make_empty_encoder_model_runner_output, ) from vllm.v1.pool.metadata import PoolingMetadata, PoolingStates from vllm.v1.sample.logits_processor import LogitsProcessors, build_logitsprocs from vllm.v1.sample.logits_processor.interface import LogitsProcessor from vllm.v1.sample.metadata import SamplingMetadata from vllm.v1.sample.rejection_sampler import RejectionSampler from vllm.v1.sample.sampler import Sampler from vllm.v1.spec_decode.eagle import EagleProposer from vllm.v1.spec_decode.medusa import MedusaProposer from vllm.v1.spec_decode.metadata import SpecDecodeMetadata from vllm.v1.spec_decode.ngram_proposer import NgramProposer from vllm.v1.spec_decode.suffix_decoding import SuffixDecodingProposer from vllm.v1.structured_output.utils import apply_grammar_bitmask from vllm.v1.utils import CpuGpuBuffer, record_function_or_nullcontext from vllm.v1.worker.cp_utils import check_attention_cp_compatibility from vllm.v1.worker.dp_utils import coordinate_batch_across_dp from vllm.v1.worker.ec_connector_model_runner_mixin import ECConnectorModelRunnerMixin from vllm.v1.worker.gpu_input_batch import CachedRequestState, InputBatch from vllm.v1.worker.gpu_ubatch_wrapper import UBatchWrapper from vllm.v1.worker.kv_connector_model_runner_mixin import KVConnectorModelRunnerMixin from vllm.v1.worker.lora_model_runner_mixin import LoRAModelRunnerMixin from vllm.v1.worker.ubatch_utils import ( UBatchSlices, check_ubatch_thresholds, maybe_create_ubatch_slices, ) from vllm.v1.worker.utils import is_residual_scattered_for_sp from vllm.v1.worker.workspace import lock_workspace from .utils import ( AttentionGroup, MultiModalBudget, add_kv_sharing_layers_to_kv_cache_groups, bind_kv_cache, sanity_check_mm_encoder_outputs, ) if TYPE_CHECKING: from vllm.model_executor.model_loader.tensorizer import TensorizerConfig from vllm.v1.core.sched.output import GrammarOutput, SchedulerOutput logger = init_logger(__name__) AttnMetadataDict: TypeAlias = dict[str, AttentionMetadata] # list when ubatching is enabled PerLayerAttnMetadata: TypeAlias = list[AttnMetadataDict] | AttnMetadataDict # Wrapper for ModelRunnerOutput to support overlapped execution. class AsyncGPUModelRunnerOutput(AsyncModelRunnerOutput): def __init__( self, model_runner_output: ModelRunnerOutput, sampled_token_ids: torch.Tensor, logprobs_tensors: LogprobsTensors | None, invalid_req_indices: list[int], async_output_copy_stream: torch.cuda.Stream, vocab_size: int, ): self._model_runner_output = model_runner_output self._invalid_req_indices = invalid_req_indices # Event on the copy stream so we can synchronize the non-blocking copy. self.async_copy_ready_event = torch.Event() # Keep a reference to the device tensor to avoid it being # deallocated until we finish copying it to the host. self._sampled_token_ids = sampled_token_ids self.vocab_size = vocab_size self._logprobs_tensors = logprobs_tensors # Initiate the copy on a separate stream, but do not synchronize it. default_stream = torch.cuda.current_stream() with torch.cuda.stream(async_output_copy_stream): async_output_copy_stream.wait_stream(default_stream) self.sampled_token_ids_cpu = self._sampled_token_ids.to( "cpu", non_blocking=True ) self._logprobs_tensors_cpu = ( self._logprobs_tensors.to_cpu_nonblocking() if self._logprobs_tensors else None ) self.async_copy_ready_event.record() def get_output(self) -> ModelRunnerOutput: """Copy the device tensors to the host and return a ModelRunnerOutput. This function blocks until the copy is finished. """ max_gen_len = self.sampled_token_ids_cpu.shape[-1] self.async_copy_ready_event.synchronize() # Release the device tensors once the copy has completed. del self._logprobs_tensors del self._sampled_token_ids if max_gen_len == 1: valid_sampled_token_ids = self.sampled_token_ids_cpu.tolist() for i in self._invalid_req_indices: valid_sampled_token_ids[i].clear() cu_num_tokens = None else: valid_sampled_token_ids, cu_num_tokens = RejectionSampler.parse_output( self.sampled_token_ids_cpu, self.vocab_size, self._invalid_req_indices, return_cu_num_tokens=self._logprobs_tensors_cpu is not None, ) output = self._model_runner_output output.sampled_token_ids = valid_sampled_token_ids if self._logprobs_tensors_cpu: output.logprobs = self._logprobs_tensors_cpu.tolists(cu_num_tokens) return output class ExecuteModelState(NamedTuple): """Ephemeral cached state transferred between execute_model() and sample_tokens(), after execute_model() returns None.""" scheduler_output: "SchedulerOutput" logits: torch.Tensor spec_decode_metadata: SpecDecodeMetadata | None spec_decode_common_attn_metadata: CommonAttentionMetadata | None hidden_states: torch.Tensor sample_hidden_states: torch.Tensor aux_hidden_states: list[torch.Tensor] | None ec_connector_output: ECConnectorOutput | None cudagraph_stats: CUDAGraphStat | None class GPUModelRunner( LoRAModelRunnerMixin, KVConnectorModelRunnerMixin, ECConnectorModelRunnerMixin ): def __init__( self, vllm_config: VllmConfig, device: torch.device, ): self.vllm_config = vllm_config self.model_config = vllm_config.model_config self.cache_config = vllm_config.cache_config self.compilation_config = vllm_config.compilation_config self.lora_config = vllm_config.lora_config self.load_config = vllm_config.load_config self.parallel_config = vllm_config.parallel_config self.scheduler_config = vllm_config.scheduler_config self.speculative_config = vllm_config.speculative_config self.observability_config = vllm_config.observability_config from vllm.model_executor.models.utils import set_cpu_offload_max_bytes set_cpu_offload_max_bytes(int(self.cache_config.cpu_offload_gb * 1024**3)) model_config = self.model_config cache_config = self.cache_config scheduler_config = self.scheduler_config parallel_config = self.parallel_config self.device = device self.pin_memory = is_pin_memory_available() self.dtype = self.model_config.dtype self.kv_cache_dtype = kv_cache_dtype_str_to_dtype( cache_config.cache_dtype, self.model_config ) self.is_pooling_model = model_config.runner_type == "pooling" self.enable_prompt_embeds = model_config.enable_prompt_embeds self.is_multimodal_raw_input_only_model = ( model_config.is_multimodal_raw_input_only_model ) # This will be overridden in load_model() self.is_multimodal_pruning_enabled = False self.max_model_len = model_config.max_model_len # Always set to false after the first forward pass self.calculate_kv_scales = self.cache_config.calculate_kv_scales self.dcp_world_size = self.parallel_config.decode_context_parallel_size self.dcp_rank = 0 if self.dcp_world_size <= 1 else get_dcp_group().rank_in_group self.max_num_tokens = scheduler_config.max_num_batched_tokens self.max_num_reqs = scheduler_config.max_num_seqs # Broadcast PP output for external_launcher (torchrun) # to make sure we are synced across pp ranks # TODO: Support overlapping mirco-batches # https://github.com/vllm-project/vllm/issues/18019 self.broadcast_pp_output = ( self.parallel_config.distributed_executor_backend == "external_launcher" and len(get_pp_group().ranks) > 0 ) # Model-related. self.num_query_heads = model_config.get_num_attention_heads(parallel_config) self.inputs_embeds_size = model_config.get_inputs_embeds_size() self.attention_chunk_size = model_config.attention_chunk_size # Only relevant for models using ALiBi (e.g, MPT) self.use_alibi = model_config.uses_alibi self.cascade_attn_enabled = not self.model_config.disable_cascade_attn self.is_mm_prefix_lm = self.model_config.is_mm_prefix_lm # Multi-modal data support self.mm_registry = MULTIMODAL_REGISTRY self.uses_mrope = model_config.uses_mrope self.uses_xdrope_dim = model_config.uses_xdrope_dim self.supports_mm_inputs = self.mm_registry.supports_multimodal_inputs( model_config ) if self.model_config.is_encoder_decoder: # Maximum length of the encoder input, only for encoder-decoder # models. self.max_encoder_len = scheduler_config.max_num_encoder_input_tokens else: self.max_encoder_len = 0 # Sampler self.sampler = Sampler(logprobs_mode=self.model_config.logprobs_mode) self.eplb_state: EplbState | None = None """ State of the expert parallelism load balancer. Will be lazily initialized when the model is loaded. """ # Lazy initializations # self.model: nn.Module # Set after load_model # Initialize in initialize_kv_cache self.kv_caches: list[torch.Tensor] = [] # Initialize in initialize_kv_cache_tensors self.cross_layers_kv_cache: torch.Tensor | None = None self.cross_layers_attn_backend: type[AttentionBackend] | None = None # indexes: [kv_cache_group_id][attn_group] self.attn_groups: list[list[AttentionGroup]] = [] # self.kv_cache_config: KVCacheConfig # mm_hash -> encoder_output self.encoder_cache: dict[str, torch.Tensor] = {} self.use_aux_hidden_state_outputs = False # Set up speculative decoding. # NOTE(Jiayi): currently we put the entire draft model on # the last PP rank. This is not ideal if there are many # layers in the draft model. if self.speculative_config and get_pp_group().is_last_rank: self.drafter: ( NgramProposer | SuffixDecodingProposer | EagleProposer | MedusaProposer ) if self.speculative_config.method == "ngram": self.drafter = NgramProposer(self.vllm_config) elif self.speculative_config.method == "suffix": self.drafter = SuffixDecodingProposer(self.vllm_config) elif self.speculative_config.use_eagle(): self.drafter = EagleProposer(self.vllm_config, self.device, self) if self.speculative_config.method == "eagle3": self.use_aux_hidden_state_outputs = ( self.drafter.eagle3_use_aux_hidden_state ) elif self.speculative_config.method == "medusa": self.drafter = MedusaProposer( vllm_config=self.vllm_config, device=self.device ) else: raise ValueError( "Unknown speculative decoding method: " f"{self.speculative_config.method}" ) self.rejection_sampler = RejectionSampler(self.sampler) self.num_spec_tokens = 0 if self.speculative_config: self.num_spec_tokens = self.speculative_config.num_speculative_tokens # Request states. self.requests: dict[str, CachedRequestState] = {} # NOTE(rob): num_prompt_logprobs only includes reqs # that are currently in the prefill phase. self.num_prompt_logprobs: dict[str, int] = {} self.comm_stream = torch.cuda.Stream() # Input Batch # NOTE(Chen): Ideally, we should initialize the input batch inside # `initialize_kv_cache` based on the kv cache config. However, as in # https://github.com/vllm-project/vllm/pull/18298, due to some unknown # reasons, we have to initialize the input batch before `load_model`, # quantization + weight offloading will fail otherwise. As a temporary # solution, we initialize the input batch here, and re-initialize it # in `initialize_kv_cache` if the block_sizes here is different from # the block_sizes in the kv cache config. logits_processors = model_config.logits_processors custom_logitsprocs: Sequence[str | type[LogitsProcessor]] = ( tuple(logits_processors) if logits_processors is not None else () ) self.input_batch = InputBatch( max_num_reqs=self.max_num_reqs, # We need to use the encoder length for encoder-decoer # because of KV cache for cross-attention. max_model_len=max(self.max_model_len, self.max_encoder_len), max_num_batched_tokens=self.max_num_tokens, device=self.device, pin_memory=self.pin_memory, vocab_size=self.model_config.get_vocab_size(), block_sizes=[self.cache_config.block_size], kernel_block_sizes=[self.cache_config.block_size], is_spec_decode=bool(self.vllm_config.speculative_config), logitsprocs=build_logitsprocs( self.vllm_config, self.device, self.pin_memory, self.is_pooling_model, custom_logitsprocs, ), # We currently don't know whether a particular custom logits processor # uses output token ids so we set this conservatively. logitsprocs_need_output_token_ids=bool(custom_logitsprocs), is_pooling_model=self.is_pooling_model, cp_kv_cache_interleave_size=self.parallel_config.cp_kv_cache_interleave_size, ) self.use_async_scheduling = self.scheduler_config.async_scheduling # Separate cuda stream for overlapping transfer of sampled token ids from # GPU to CPU when async scheduling is enabled. self.async_output_copy_stream: torch.cuda.Stream | None = None # cuda event to synchronize use of reused CPU tensors between steps # when async scheduling is enabled. self.prepare_inputs_event: torch.Event | None = None if self.use_async_scheduling: self.async_output_copy_stream = torch.cuda.Stream() self.prepare_inputs_event = torch.Event() # self.cudagraph_batch_sizes sorts in ascending order. if ( self.compilation_config.cudagraph_capture_sizes and self.compilation_config.cudagraph_mode != CUDAGraphMode.NONE ): self.cudagraph_batch_sizes = sorted( self.compilation_config.cudagraph_capture_sizes ) # Cache the device properties. self._init_device_properties() # Persistent buffers for CUDA graphs. self.input_ids = self._make_buffer(self.max_num_tokens, dtype=torch.int32) self.positions = self._make_buffer(self.max_num_tokens, dtype=torch.int64) self.query_start_loc = self._make_buffer( self.max_num_reqs + 1, dtype=torch.int32 ) self.seq_lens = self._make_buffer(self.max_num_reqs, dtype=torch.int32) self.encoder_seq_lens = self._make_buffer(self.max_num_reqs, dtype=torch.int32) if self.dcp_world_size > 1: self.dcp_local_seq_lens = self._make_buffer( self.max_num_reqs, dtype=torch.int32 ) # Because inputs_embeds may be bfloat16 and we don't need a numpy # version of this tensor, avoid a RuntimeError by not creating a # numpy buffer. self.inputs_embeds = self._make_buffer( self.max_num_tokens, self.inputs_embeds_size, dtype=self.dtype, numpy=False ) self.is_token_ids = self._make_buffer(self.max_num_tokens, dtype=torch.bool) self.discard_request_mask = self._make_buffer( self.max_num_reqs, dtype=torch.bool ) self.num_decode_draft_tokens = self._make_buffer( self.max_num_reqs, dtype=torch.int32 ) self.num_accepted_tokens = self._make_buffer( self.max_num_reqs, dtype=torch.int64 ) # Only relevant for multimodal models if self.supports_mm_inputs: self.is_mm_embed = self._make_buffer(self.max_num_tokens, dtype=torch.bool) # Only relevant for models using M-RoPE (e.g, Qwen2-VL) if self.uses_mrope: # NOTE: `mrope_positions` is implemented with one additional dummy # position on purpose to make it non-contiguous so that it can work # with torch compile. # See detailed explanation in https://github.com/vllm-project/vllm/pull/12128#discussion_r1926431923 # NOTE: When M-RoPE is enabled, position ids are 3D regardless of # the modality of inputs. For text-only inputs, each dimension has # identical position IDs, making M-RoPE functionally equivalent to # 1D-RoPE. # See page 5 of https://arxiv.org/abs/2409.12191 self.mrope_positions = self._make_buffer( (3, self.max_num_tokens + 1), dtype=torch.int64 ) # Only relevant for models using XD-RoPE (e.g, HunYuan-VL) if self.uses_xdrope_dim > 0: # Similar to mrope but use assigned dimension number for RoPE, 4 as default. self.xdrope_positions = self._make_buffer( (self.uses_xdrope_dim, self.max_num_tokens + 1), dtype=torch.int64 ) # None in the first PP rank. The rest are set after load_model. self.intermediate_tensors: IntermediateTensors | None = None # OPTIMIZATION: Cache the tensors rather than creating them every step. # Keep in int64 to avoid overflow with long context self.arange_np = np.arange( max(self.max_num_reqs + 1, self.max_model_len, self.max_num_tokens), dtype=np.int64, ) # Layer pairings for cross-layer KV sharing. # If an Attention layer `layer_name` is in the keys of this dict, it # means this layer will perform attention using the keys and values # from the KV cache of `shared_kv_cache_layers[layer_name]`. self.shared_kv_cache_layers: dict[str, str] = {} self.kv_sharing_fast_prefill_eligible_layers: set[str] = set() self.kv_sharing_fast_prefill_logits_indices = None if self.cache_config.kv_sharing_fast_prefill: self.kv_sharing_fast_prefill_logits_indices = torch.zeros( self.max_num_tokens, dtype=torch.int32, device=self.device ) self.uniform_decode_query_len = 1 + self.num_spec_tokens # Cudagraph dispatcher for runtime cudagraph dispatching. self.cudagraph_dispatcher = CudagraphDispatcher(self.vllm_config) self.mm_budget = ( MultiModalBudget( self.model_config, self.scheduler_config, self.mm_registry, ) if self.supports_mm_inputs else None ) self.reorder_batch_threshold: int | None = None # Attention layers that are only in the KVCacheConfig of the runner # (e.g., KV sharing, encoder-only attention), but not in the # KVCacheConfig of the scheduler. self.runner_only_attn_layers: set[str] = set() # Cached outputs. self._draft_token_ids: list[list[int]] | torch.Tensor | None = None self.transfer_event = torch.Event() self.sampled_token_ids_pinned_cpu = torch.empty( (self.max_num_reqs, 1), dtype=torch.int64, device="cpu", pin_memory=self.pin_memory, ) # Pre-allocated tensor for copying valid sampled token counts to CPU, # with dedicated stream for overlapping and event for coordination. self.valid_sampled_token_count_event: torch.Event | None = None self.valid_sampled_token_count_copy_stream: torch.cuda.Stream | None = None if self.use_async_scheduling and self.num_spec_tokens: self.valid_sampled_token_count_event = torch.Event() self.valid_sampled_token_count_copy_stream = torch.cuda.Stream() self.valid_sampled_token_count_cpu = torch.empty( self.max_num_reqs, dtype=torch.int64, device="cpu", pin_memory=self.pin_memory, ) # Ephemeral state transferred between execute_model() and sample_tokens(). self.execute_model_state: ExecuteModelState | None = None self.kv_connector_output: KVConnectorOutput | None = None self.layerwise_nvtx_hooks_registered = False def reset_mm_cache(self) -> None: if self.mm_budget: self.mm_budget.reset_cache() @torch.inference_mode() def init_fp8_kv_scales(self) -> None: """ Re-initialize the KV cache and FP8 scales after waking from sleep. 1. Zero out the KV cache tensors to remove garbage data from re-allocation. 2. Reset Attention layer scaling factors (_k_scale, _v_scale) to 1.0. If these are left at 0.0 (default after wake_up), all KV cache values become effectively zero, causing gibberish output. """ if not self.cache_config.cache_dtype.startswith("fp8"): return kv_caches = getattr(self, "kv_caches", []) for cache_tensor in kv_caches: if cache_tensor is not None: cache_tensor.zero_() k_attr_names = ("_k_scale", "k_scale") v_attr_names = ("_v_scale", "v_scale") attn_layers = self.compilation_config.static_forward_context for name, module in attn_layers.items(): if isinstance(module, (Attention, MLAAttention)): # TODO: Generally, scale is 1.0 if user uses on-the-fly fp8 # kvcache quant. However, to get better accuracy, compression # frameworks like llm-compressors allow users to tune the # scale. We may need to restore the specific calibrated scales # here in the future. k_scale_val, v_scale_val = 1.0, 1.0 # Processing K Scale for attr in k_attr_names: if hasattr(module, attr): param = getattr(module, attr) if isinstance(param, torch.Tensor): param.fill_(k_scale_val) # Processing V Scale for attr in v_attr_names: if hasattr(module, attr): param = getattr(module, attr) if isinstance(param, torch.Tensor): param.fill_(v_scale_val) def _get_positions(self, num_tokens: Any): if isinstance(num_tokens, int): if self.uses_mrope: return self.mrope_positions.gpu[:, :num_tokens] if self.uses_xdrope_dim > 0: return self.xdrope_positions.gpu[:, :num_tokens] return self.positions.gpu[:num_tokens] else: if self.uses_mrope: return self.mrope_positions.gpu[:, num_tokens] if self.uses_xdrope_dim > 0: return self.xdrope_positions.gpu[:, num_tokens] return self.positions.gpu[num_tokens] def _make_buffer( self, *size: int | torch.SymInt, dtype: torch.dtype, numpy: bool = True ) -> CpuGpuBuffer: return CpuGpuBuffer( *size, dtype=dtype, device=self.device, pin_memory=self.pin_memory, with_numpy=numpy, ) def _init_model_kwargs(self, num_tokens: int): model_kwargs = dict[str, Any]() if not self.is_pooling_model: return model_kwargs num_reqs = self.input_batch.num_reqs pooling_params = self.input_batch.get_pooling_params() token_type_id_requests = dict[int, Any]() for i, param in enumerate(pooling_params): if ( param.extra_kwargs is not None and (token_types := param.extra_kwargs.get("compressed_token_type_ids")) is not None ): token_type_id_requests[i] = token_types if len(token_type_id_requests) == 0: return model_kwargs seq_lens = self.seq_lens.gpu[:num_reqs] token_type_ids = [] for i in range(num_reqs): pos = token_type_id_requests.get(i, seq_lens[i]) ids = (torch.arange(seq_lens[i]) >= pos).int() token_type_ids.append(ids) model_kwargs["token_type_ids"] = torch.concat(token_type_ids).to( device=self.device ) return model_kwargs def _may_reorder_batch(self, scheduler_output: "SchedulerOutput") -> None: """ Update the order of requests in the batch based on the attention backend's needs. For example, some attention backends (namely MLA) may want to separate requests based on if the attention computation will be compute-bound or memory-bound. Args: scheduler_output: The scheduler output. """ # Attention free models have zero kv_cache_goups, however models # like Mamba are also attention free but use the kv_cache for # keeping its internal state. This is why we check the number # of kv_cache groups instead of solely checking # for self.model_config.is_attention_free. if len(self.kv_cache_config.kv_cache_groups) == 0: return if self.reorder_batch_threshold is not None: reorder_batch_to_split_decodes_and_prefills( self.input_batch, scheduler_output, decode_threshold=self.reorder_batch_threshold, ) # Note: used for model runner override. def _init_device_properties(self) -> None: """Initialize attributes from torch.cuda.get_device_properties""" self.device_properties = torch.cuda.get_device_properties(self.device) self.num_sms = self.device_properties.multi_processor_count # Note: used for model runner override. def _sync_device(self) -> None: torch.cuda.synchronize() def _update_states(self, scheduler_output: "SchedulerOutput") -> None: """Update the cached states and the persistent batch with the scheduler output. The updated states are used by the `_prepare_inputs` function to create the input GPU tensors for the model. The SamplingMetadata is updated and copied to the GPU if there is a new/resumed/paused/finished request in the batch. """ # Remove finished requests from the cached states. for req_id in scheduler_output.finished_req_ids: self.requests.pop(req_id, None) self.num_prompt_logprobs.pop(req_id, None) # Remove the finished requests from the persistent batch. # NOTE(woosuk): There could be an edge case where finished_req_ids and # scheduled_req_ids overlap. This happens when a request is aborted and # then resubmitted with the same ID. In this case, we treat them as two # distinct requests - clearing the cached states for the first request # and handling the second as a new request. for req_id in scheduler_output.finished_req_ids: self.input_batch.remove_request(req_id) # Free the cached encoder outputs. for mm_hash in scheduler_output.free_encoder_mm_hashes: self.encoder_cache.pop(mm_hash, None) # Remove the unscheduled requests from the persistent batch. # NOTE(woosuk): The unscheduled requests are either preempted requests # or running requests that are not scheduled in this step. We remove # them from the persistent batch but keep their cached states since # they will be scheduled again sometime in the future. scheduled_req_ids = scheduler_output.num_scheduled_tokens.keys() cached_req_ids = self.input_batch.req_id_to_index.keys() resumed_req_ids = scheduler_output.scheduled_cached_reqs.resumed_req_ids # NOTE(zhuohan): cached_req_ids and resumed_req_ids are usually disjoint, # so `(scheduled_req_ids - resumed_req_ids) == scheduled_req_ids` holds # apart from the forced-preemption case in reset_prefix_cache. And in # that case we include the resumed_req_ids in the unscheduled set so # that they get cleared from the persistent batch before being re-scheduled # in the normal resumed request path. unscheduled_req_ids = cached_req_ids - (scheduled_req_ids - resumed_req_ids) # NOTE(woosuk): The persistent batch optimization assumes that # consecutive batches contain mostly the same requests. If batches # have low request overlap (e.g., alternating between two distinct # sets of requests), this optimization becomes very inefficient. for req_id in unscheduled_req_ids: self.input_batch.remove_request(req_id) reqs_to_add: list[CachedRequestState] = [] # Add new requests to the cached states. for new_req_data in scheduler_output.scheduled_new_reqs: req_id = new_req_data.req_id sampling_params = new_req_data.sampling_params pooling_params = new_req_data.pooling_params if ( sampling_params and sampling_params.sampling_type == SamplingType.RANDOM_SEED ): generator = torch.Generator(device=self.device) generator.manual_seed(sampling_params.seed) else: generator = None if self.is_pooling_model: assert pooling_params is not None task = pooling_params.task assert task is not None, "You did not set `task` in the API" model = cast(VllmModelForPooling, self.get_model()) to_update = model.pooler.get_pooling_updates(task) to_update.apply(pooling_params) req_state = CachedRequestState( req_id=req_id, prompt_token_ids=new_req_data.prompt_token_ids, prompt_embeds=new_req_data.prompt_embeds, mm_features=new_req_data.mm_features, sampling_params=sampling_params, pooling_params=pooling_params, generator=generator, block_ids=new_req_data.block_ids, num_computed_tokens=new_req_data.num_computed_tokens, output_token_ids=[], lora_request=new_req_data.lora_request, ) self.requests[req_id] = req_state if sampling_params and sampling_params.prompt_logprobs is not None: self.num_prompt_logprobs[req_id] = ( self.input_batch.vocab_size if sampling_params.prompt_logprobs == -1 else sampling_params.prompt_logprobs ) # Only relevant for models using M-RoPE (e.g, Qwen2-VL) if self.uses_mrope: self._init_mrope_positions(req_state) # Only relevant for models using XD-RoPE (e.g, HunYuan-VL) if self.uses_xdrope_dim > 0: self._init_xdrope_positions(req_state) reqs_to_add.append(req_state) # Update the states of the running/resumed requests. is_last_rank = get_pp_group().is_last_rank req_data = scheduler_output.scheduled_cached_reqs # Wait until valid_sampled_tokens_count is copied to cpu, # then use it to update actual num_computed_tokens of each request. valid_sampled_token_count = self._get_valid_sampled_token_count() for i, req_id in enumerate(req_data.req_ids): req_state = self.requests[req_id] num_computed_tokens = req_data.num_computed_tokens[i] new_block_ids = req_data.new_block_ids[i] resumed_from_preemption = req_id in req_data.resumed_req_ids num_output_tokens = req_data.num_output_tokens[i] req_index = self.input_batch.req_id_to_index.get(req_id) # prev_num_draft_len is used in async scheduling mode with # spec decode. it indicates if need to update num_computed_tokens # of the request. for example: # fist step: num_computed_tokens = 0, spec_tokens = [], # prev_num_draft_len = 0. # second step: num_computed_tokens = 100(prompt lenth), # spec_tokens = [a,b], prev_num_draft_len = 0. # third step: num_computed_tokens = 100 + 2, spec_tokens = [c,d], # prev_num_draft_len = 2. # num_computed_tokens in first step and second step does't contain # the spec tokens length, but in third step it contains the # spec tokens length. we only need to update num_computed_tokens # when prev_num_draft_len > 0. if req_state.prev_num_draft_len: if req_index is None: req_state.prev_num_draft_len = 0 else: assert self.input_batch.prev_req_id_to_index is not None prev_req_index = self.input_batch.prev_req_id_to_index[req_id] num_accepted = valid_sampled_token_count[prev_req_index] - 1 num_rejected = req_state.prev_num_draft_len - num_accepted num_computed_tokens -= num_rejected req_state.output_token_ids.extend([-1] * num_accepted) # Update the cached states. req_state.num_computed_tokens = num_computed_tokens if not is_last_rank: # When using PP, the scheduler sends the sampled tokens back, # because there's no direct communication between the first- # stage worker and the last-stage worker. new_token_ids = req_data.new_token_ids[i] # Add the sampled token(s) from the previous step (if any). # This doesn't include "unverified" tokens like spec tokens. num_new_tokens = ( num_computed_tokens + len(new_token_ids) - req_state.num_tokens ) if num_new_tokens == 1: # Avoid slicing list in most common case. req_state.output_token_ids.append(new_token_ids[-1]) elif num_new_tokens > 0: req_state.output_token_ids.extend(new_token_ids[-num_new_tokens:]) elif num_output_tokens < len(req_state.output_token_ids): # Some output tokens were discarded due to a sync-KV-load # failure. Align the cached state. del req_state.output_token_ids[num_output_tokens:] if req_index is not None: end_idx = ( self.input_batch.num_prompt_tokens[req_index] + num_output_tokens ) self.input_batch.num_tokens[req_index] = end_idx self.input_batch.num_tokens_no_spec[req_index] = end_idx # Update the block IDs. if not resumed_from_preemption: if new_block_ids is not None: # Append the new blocks to the existing block IDs. for block_ids, new_ids in zip(req_state.block_ids, new_block_ids): block_ids.extend(new_ids) else: assert req_index is None assert new_block_ids is not None # The request is resumed from preemption. # Replace the existing block IDs with the new ones. req_state.block_ids = new_block_ids if req_index is None: # The request is not in the persistent batch. # The request was either preempted and resumed later, or was not # scheduled in the previous step and needs to be added again. if self.use_async_scheduling and num_output_tokens > 0: # We must recover the output token ids for resumed requests in the # async scheduling case, so that correct input_ids are obtained. resumed_token_ids = req_data.all_token_ids[req_id] req_state.output_token_ids = resumed_token_ids[-num_output_tokens:] reqs_to_add.append(req_state) continue # Update the persistent batch. self.input_batch.num_computed_tokens_cpu[req_index] = num_computed_tokens if new_block_ids is not None: self.input_batch.block_table.append_row(new_block_ids, req_index) # For the last rank, we don't need to update the token_ids_cpu # because the sampled tokens are already cached. if not is_last_rank: # Add new_token_ids to token_ids_cpu. start_token_index = num_computed_tokens end_token_index = num_computed_tokens + len(new_token_ids) self.input_batch.token_ids_cpu[ req_index, start_token_index:end_token_index ] = new_token_ids self.input_batch.num_tokens_no_spec[req_index] = end_token_index self.input_batch.num_tokens[req_index] = end_token_index # Add spec_token_ids to token_ids_cpu. spec_token_ids = scheduler_output.scheduled_spec_decode_tokens.get( req_id, [] ) num_spec_tokens = len(spec_token_ids) # For async scheduling, token_ids_cpu assigned from # spec_token_ids are placeholders and will be overwritten in # _prepare_input_ids. if num_spec_tokens: start_index = self.input_batch.num_tokens_no_spec[req_index] end_token_index = start_index + num_spec_tokens self.input_batch.token_ids_cpu[ req_index, start_index:end_token_index ] = spec_token_ids # NOTE(woosuk): `num_tokens` here may include spec tokens. self.input_batch.num_tokens[req_index] += num_spec_tokens # When speculative decoding is used with structured output, # the scheduler can drop draft tokens that do not # conform to the schema. This can result in # scheduler_output.scheduled_spec_decode_tokens being empty, # even when speculative decoding is enabled. self.input_batch.spec_token_ids[req_index].clear() self.input_batch.spec_token_ids[req_index].extend(spec_token_ids) # there are no draft tokens with async scheduling, # we clear the spec_decoding info in scheduler_output and # use normal sampling but rejection_sampling. if self.use_async_scheduling: req_state.prev_num_draft_len = num_spec_tokens if num_spec_tokens and self._draft_token_ids is None: scheduler_output.total_num_scheduled_tokens -= num_spec_tokens scheduler_output.num_scheduled_tokens[req_id] -= num_spec_tokens scheduler_output.scheduled_spec_decode_tokens.pop(req_id, None) # Add the new or resumed requests to the persistent batch. # The smaller empty indices are filled first. for request in reqs_to_add: self.input_batch.add_request(request) # Condense the batched states if there are gaps left by removed requests self.input_batch.condense() # Allow attention backend to reorder the batch, potentially self._may_reorder_batch(scheduler_output) # Refresh batch metadata with any pending updates. self.input_batch.refresh_metadata() def _update_states_after_model_execute( self, output_token_ids: torch.Tensor ) -> None: """Update the cached states after model execution. This is used for MTP/EAGLE for hybrid models, as in linear attention, only the last token's state is kept. In MTP/EAGLE, for draft tokens the state are kept util we decide how many tokens are accepted for each sequence, and a shifting is done during the next iteration based on the number of accepted tokens. """ if not self.model_config.is_hybrid or not self.speculative_config: return # Find the number of accepted tokens for each sequence. num_accepted_tokens = ( ( torch.cat( [ output_token_ids, torch.full( (output_token_ids.size(0), 1), -1, device=output_token_ids.device, ), ], dim=1, ) == -1 ) .int() .argmax(-1) .cpu() .numpy() ) for i, num_tokens in enumerate(num_accepted_tokens): self.input_batch.num_accepted_tokens_cpu[i] = num_tokens def _init_mrope_positions(self, req_state: CachedRequestState): model = self.get_model() assert supports_mrope(model), "M-RoPE support is not implemented." assert req_state.prompt_token_ids is not None, ( "M-RoPE requires prompt_token_ids to be available." ) mrope_model = cast(SupportsMRoPE, model) req_state.mrope_positions, req_state.mrope_position_delta = ( mrope_model.get_mrope_input_positions( req_state.prompt_token_ids, req_state.mm_features, ) ) def _init_xdrope_positions(self, req_state: CachedRequestState): model = self.get_model() xdrope_model = cast(SupportsXDRoPE, model) assert req_state.prompt_token_ids is not None, ( "XD-RoPE requires prompt_token_ids to be available." ) assert supports_xdrope(model), "XD-RoPE support is not implemented." req_state.xdrope_positions = xdrope_model.get_xdrope_input_positions( req_state.prompt_token_ids, req_state.mm_features, ) def _extract_mm_kwargs( self, scheduler_output: "SchedulerOutput", ) -> BatchedTensorInputs: if not scheduler_output or not self.is_multimodal_raw_input_only_model: return {} mm_kwargs = list[MultiModalKwargsItem]() for req in scheduler_output.scheduled_new_reqs: for feature in req.mm_features: if feature.data is not None: mm_kwargs.append(feature.data) # Input all modalities at once model = cast(SupportsMultiModal, self.model) mm_kwargs_combined: BatchedTensorInputs = {} for _, _, mm_kwargs_group in group_mm_kwargs_by_modality( mm_kwargs, device=self.device, pin_memory=self.pin_memory, merge_by_field_config=model.merge_by_field_config, ): mm_kwargs_combined.update(mm_kwargs_group) return mm_kwargs_combined def _dummy_mm_kwargs(self, num_seqs: int) -> BatchedTensorInputs: if not self.is_multimodal_raw_input_only_model: return {} mm_budget = self.mm_budget assert mm_budget is not None dummy_modality = mm_budget.get_modality_with_max_tokens() return self._get_mm_dummy_batch(dummy_modality, num_seqs) def _get_cumsum_and_arange( self, num_tokens: np.ndarray, cumsum_dtype: np.dtype | None = None, ) -> tuple[np.ndarray, np.ndarray]: """Get the cumulative sum and batched arange of the given array. # E.g., [2, 5, 3] -> ([2, 7, 10], [0, 1, 0, 1, 2, 3, 4, 0, 1, 2]) # Equivalent to but faster than: # np.concatenate([np.arange(n) for n in num_tokens]) """ # Step 1. [2, 5, 3] -> [2, 7, 10] cu_num_tokens = np.cumsum(num_tokens, dtype=cumsum_dtype) total_num_tokens = cu_num_tokens[-1] # Step 2. [2, 7, 10] -> [0, 0, 2, 2, 2, 2, 2, 7, 7, 7] cumsums_offsets = np.repeat(cu_num_tokens - num_tokens, num_tokens) # Step 3. [0, 1, 0, 1, 2, 3, 4, 0, 1, 2] arange = self.arange_np[:total_num_tokens] - cumsums_offsets return cu_num_tokens, arange def _prepare_input_ids( self, scheduler_output: "SchedulerOutput", total_num_scheduled_tokens: int, cu_num_tokens: np.ndarray, ) -> None: """Prepare the input IDs for the current batch. Carefully handles the `prev_sampled_token_ids` which can be cached from the previous engine iteration, in which case those tokens on the GPU need to be copied into the corresponding slots into input_ids.""" if self.input_batch.prev_sampled_token_ids is None: # Normal scheduling case self.input_ids.copy_to_gpu(total_num_scheduled_tokens) if self.enable_prompt_embeds: self.inputs_embeds.copy_to_gpu(total_num_scheduled_tokens) self.is_token_ids.copy_to_gpu(total_num_scheduled_tokens) return # Async scheduling case, where some decode requests from the previous # iteration won't have entries in input_ids_cpu and need to be copied # on the GPU from prev_sampled_token_ids. prev_req_id_to_index = self.input_batch.prev_req_id_to_index assert prev_req_id_to_index is not None sample_flattened_indices: list[int] = [] spec_flattened_indices: list[int] = [] prev_common_req_indices: list[int] = [] prev_draft_token_indices: list[int] = [] indices_match = True max_flattened_index = -1 total_num_spec_tokens = 0 scheduled_spec_tokens = scheduler_output.scheduled_spec_decode_tokens for req_id, cur_index in self.input_batch.req_id_to_index.items(): if (prev_index := prev_req_id_to_index.get(req_id)) is not None: prev_common_req_indices.append(prev_index) # We need to compute the flattened input_ids index of the # last token in each common request. draft_len = len(scheduled_spec_tokens.get(req_id, ())) total_num_spec_tokens += draft_len flattened_index = cu_num_tokens[cur_index].item() - 1 # example: cu_num_tokens = [2, 5, 8], draft_tokens = [1, 2, 2] # sample_flattened_indices = [0, 2, 5] # spec_flattened_indices = [1, 3, 4, 6, 7] sample_flattened_indices.append(flattened_index - draft_len) spec_flattened_indices.extend( range(flattened_index - draft_len + 1, flattened_index + 1) ) start = prev_index * self.num_spec_tokens # prev_draft_token_indices is used to find which draft_tokens_id # should be copied to input_ids # example: prev draft_tokens_id [[1,2], [3,4], [5, 6]] # flatten draft_tokens_id [1,2,3,4,5,6] # draft_len of each request [1, 2, 1] # then prev_draft_token_indices is [0, 2, 3, 4] prev_draft_token_indices.extend(range(start, start + draft_len)) indices_match &= prev_index == flattened_index max_flattened_index = max(max_flattened_index, flattened_index) num_commmon_tokens = len(sample_flattened_indices) total_without_spec = total_num_scheduled_tokens - total_num_spec_tokens if num_commmon_tokens < total_without_spec: # If not all requests are decodes from the last iteration, # We need to copy the input_ids_cpu to the GPU first. self.input_ids.copy_to_gpu(total_num_scheduled_tokens) if self.enable_prompt_embeds: self.inputs_embeds.copy_to_gpu(total_num_scheduled_tokens) self.is_token_ids.copy_to_gpu(total_num_scheduled_tokens) if num_commmon_tokens == 0: # No requests in common with the previous iteration # So input_ids.cpu will have all the input ids. return if indices_match and max_flattened_index == (num_commmon_tokens - 1): # Common-case optimization: the batch is unchanged # and no reordering happened. # The indices are both the same permutation of 0..N-1 so # we can copy directly using a single slice. self.input_ids.gpu[:num_commmon_tokens].copy_( self.input_batch.prev_sampled_token_ids[:num_commmon_tokens, 0], non_blocking=True, ) if self.enable_prompt_embeds: self.is_token_ids.gpu[:num_commmon_tokens] = True return # Upload the index tensors asynchronously so the scatter can be non-blocking. sampled_tokens_index_tensor = torch.tensor( sample_flattened_indices, dtype=torch.int64, pin_memory=self.pin_memory ).to(self.device, non_blocking=True) prev_common_req_indices_tensor = torch.tensor( prev_common_req_indices, dtype=torch.int64, pin_memory=self.pin_memory ).to(self.device, non_blocking=True) self.input_ids.gpu.scatter_( dim=0, index=sampled_tokens_index_tensor, src=self.input_batch.prev_sampled_token_ids[ prev_common_req_indices_tensor, 0 ], ) # Scatter the draft tokens after the sampled tokens are scattered. if self._draft_token_ids is None or not spec_flattened_indices: return assert isinstance(self._draft_token_ids, torch.Tensor) draft_tokens_index_tensor = torch.tensor( spec_flattened_indices, dtype=torch.int64, pin_memory=self.pin_memory ).to(self.device, non_blocking=True) prev_draft_token_indices_tensor = torch.tensor( prev_draft_token_indices, dtype=torch.int64, pin_memory=self.pin_memory ).to(self.device, non_blocking=True) # because input_ids dtype is torch.int32, # so convert draft_token_ids to torch.int32 here. draft_token_ids = self._draft_token_ids.to(dtype=torch.int32) self._draft_token_ids = None self.input_ids.gpu.scatter_( dim=0, index=draft_tokens_index_tensor, src=draft_token_ids.flatten()[prev_draft_token_indices_tensor], ) def _get_encoder_seq_lens( self, num_scheduled_tokens: dict[str, int], kv_cache_spec: KVCacheSpec, num_reqs: int, ) -> tuple[torch.Tensor | None, np.ndarray | None]: if not isinstance(kv_cache_spec, CrossAttentionSpec): return None, None # Zero out buffer for padding requests that are not actually scheduled (CGs) self.encoder_seq_lens.np[:num_reqs] = 0 # Build encoder_seq_lens array mapping request indices to # encoder lengths for inputs scheduled in this batch for req_id in num_scheduled_tokens: req_index = self.input_batch.req_id_to_index[req_id] req_state = self.requests[req_id] if req_state.mm_features is None: self.encoder_seq_lens.np[req_index] = 0 continue # Get the total number of encoder input tokens for running encoder requests # whether encoding is finished or not so that cross-attention knows how # many encoder tokens to attend to. encoder_input_tokens = sum( feature.mm_position.length for feature in req_state.mm_features ) self.encoder_seq_lens.np[req_index] = encoder_input_tokens self.encoder_seq_lens.copy_to_gpu(num_reqs) encoder_seq_lens = self.encoder_seq_lens.gpu[:num_reqs] encoder_seq_lens_cpu = self.encoder_seq_lens.np[:num_reqs] return encoder_seq_lens, encoder_seq_lens_cpu def _prepare_inputs( self, scheduler_output: "SchedulerOutput", num_scheduled_tokens: np.ndarray, ) -> tuple[ torch.Tensor, SpecDecodeMetadata | None, ]: """ :return: tuple[ logits_indices, spec_decode_metadata, ] """ total_num_scheduled_tokens = scheduler_output.total_num_scheduled_tokens assert total_num_scheduled_tokens > 0 num_reqs = self.input_batch.num_reqs assert num_reqs > 0 # OPTIMIZATION: Start copying the block table first. # This way, we can overlap the copy with the following CPU operations. self.input_batch.block_table.commit_block_table(num_reqs) # Get request indices. # E.g., [2, 5, 3] -> [0, 0, 1, 1, 1, 1, 1, 2, 2, 2] req_indices = np.repeat(self.arange_np[:num_reqs], num_scheduled_tokens) # cu_num_tokens: [2, 5, 3] -> [2, 7, 10] # arange: [0, 1, 0, 1, 2, 3, 4, 0, 1, 2] cu_num_tokens, arange = self._get_cumsum_and_arange(num_scheduled_tokens) # Get positions. positions_np = self.positions.np[:total_num_scheduled_tokens] np.add( self.input_batch.num_computed_tokens_cpu[req_indices], arange, out=positions_np, ) # Calculate M-RoPE positions. # Only relevant for models using M-RoPE (e.g, Qwen2-VL) if self.uses_mrope: self._calc_mrope_positions(scheduler_output) # Calculate XD-RoPE positions. # Only relevant for models using XD-RoPE (e.g, HunYuan-VL) if self.uses_xdrope_dim > 0: self._calc_xdrope_positions(scheduler_output) # Get token indices. # E.g., [0, 1, 0, 1, 2, 3, 4, 0, 1, 2] # -> [0, 1, M, M + 1, M + 2, M + 3, M + 4, 2 * M, 2 * M + 1, 2 * M + 2] # where M is the max_model_len. token_indices = ( positions_np + req_indices * self.input_batch.token_ids_cpu.shape[1] ) token_indices_tensor = torch.from_numpy(token_indices) # NOTE(woosuk): We use torch.index_select instead of np.take here # because torch.index_select is much faster than np.take for large # tensors. torch.index_select( self.input_batch.token_ids_cpu_tensor.flatten(), 0, token_indices_tensor, out=self.input_ids.cpu[:total_num_scheduled_tokens], ) if self.enable_prompt_embeds: is_token_ids = self.input_batch.is_token_ids_tensor.flatten() torch.index_select( is_token_ids, 0, token_indices_tensor, out=self.is_token_ids.cpu[:total_num_scheduled_tokens], ) # Because we did not pre-allocate a massive prompt_embeds CPU tensor on # the InputBatch, we need to fill in the prompt embeds into the expected # spots in the GpuModelRunner's pre-allocated prompt_embeds tensor. if self.input_batch.req_prompt_embeds: output_idx = 0 for req_idx in range(num_reqs): num_sched = num_scheduled_tokens[req_idx] # Skip if this request doesn't have embeddings if req_idx not in self.input_batch.req_prompt_embeds: output_idx += num_sched continue # Skip if no tokens scheduled if num_sched <= 0: output_idx += num_sched continue req_embeds = self.input_batch.req_prompt_embeds[req_idx] start_pos = self.input_batch.num_computed_tokens_cpu[req_idx] # Skip if trying to read beyond available embeddings if start_pos >= req_embeds.shape[0]: output_idx += num_sched continue # Copy available embeddings end_pos = start_pos + num_sched actual_end = min(end_pos, req_embeds.shape[0]) actual_num_sched = actual_end - start_pos if actual_num_sched > 0: self.inputs_embeds.cpu[ output_idx : output_idx + actual_num_sched ].copy_(req_embeds[start_pos:actual_end]) output_idx += num_sched self.input_batch.block_table.compute_slot_mapping(req_indices, positions_np) self.input_batch.block_table.commit_slot_mapping(total_num_scheduled_tokens) # Prepare the attention metadata. self.query_start_loc.np[0] = 0 self.query_start_loc.np[1 : num_reqs + 1] = cu_num_tokens # Note: pad query_start_loc to be non-decreasing, as kernels # like FlashAttention requires that self.query_start_loc.np[num_reqs + 1 :].fill(cu_num_tokens[-1]) self.query_start_loc.copy_to_gpu() query_start_loc = self.query_start_loc.gpu[: num_reqs + 1] self.seq_lens.np[:num_reqs] = ( self.input_batch.num_computed_tokens_cpu[:num_reqs] + num_scheduled_tokens ) # Fill unused with 0 for full cuda graph mode. self.seq_lens.np[num_reqs:].fill(0) self.seq_lens.copy_to_gpu() num_tokens = [self.requests[r].num_tokens for r in self.input_batch.req_ids] num_tokens_np = np.array(num_tokens, dtype=np.int32) # Record which requests should not be sampled, # so that we could clear the sampled tokens before returning self.discard_request_mask.np[:num_reqs] = ( self.seq_lens.np[:num_reqs] < num_tokens_np ) self.discard_request_mask.copy_to_gpu(num_reqs) # Copy the tensors to the GPU. self._prepare_input_ids( scheduler_output, total_num_scheduled_tokens, cu_num_tokens, ) if self.uses_mrope: # Only relevant for models using M-RoPE (e.g, Qwen2-VL) self.mrope_positions.gpu[:, :total_num_scheduled_tokens].copy_( self.mrope_positions.cpu[:, :total_num_scheduled_tokens], non_blocking=True, ) elif self.uses_xdrope_dim > 0: # Only relevant for models using XD-RoPE (e.g, HunYuan-VL) self.xdrope_positions.gpu[:, :total_num_scheduled_tokens].copy_( self.xdrope_positions.cpu[:, :total_num_scheduled_tokens], non_blocking=True, ) else: # Common case (1D positions) self.positions.copy_to_gpu(total_num_scheduled_tokens) use_spec_decode = len(scheduler_output.scheduled_spec_decode_tokens) > 0 if not use_spec_decode: # NOTE(woosuk): Due to chunked prefills, the batch may contain # partial requests. While we should not sample any token # from these partial requests, we do so for simplicity. # We will ignore the sampled tokens from the partial requests. # TODO: Support prompt logprobs. logits_indices = query_start_loc[1:] - 1 num_draft_tokens = None spec_decode_metadata = None num_sampled_tokens = np.ones(num_reqs, dtype=np.int32) else: # Get the number of draft tokens for each request. # Iterate over the dictionary rather than all requests since not all # requests have draft tokens. num_draft_tokens = np.zeros(num_reqs, dtype=np.int32) # For chunked prefills, use -1 as mask rather than 0, as guided # decoding may rollback speculative tokens. num_decode_draft_tokens = np.full(num_reqs, -1, dtype=np.int32) for ( req_id, draft_token_ids, ) in scheduler_output.scheduled_spec_decode_tokens.items(): req_idx = self.input_batch.req_id_to_index[req_id] num_draft_tokens[req_idx] = len(draft_token_ids) num_decode_draft_tokens[req_idx] = ( len(draft_token_ids) if ( self.input_batch.num_computed_tokens_cpu[req_idx] >= self.input_batch.num_prompt_tokens[req_idx] ) else -1 ) spec_decode_metadata = self._calc_spec_decode_metadata( num_draft_tokens, cu_num_tokens ) logits_indices = spec_decode_metadata.logits_indices num_sampled_tokens = num_draft_tokens + 1 # For DECODE only cuda graph of some attention backends (e.g., GDN). self.num_decode_draft_tokens.np[:num_reqs] = num_decode_draft_tokens self.num_decode_draft_tokens.np[num_reqs:].fill(-1) self.num_decode_draft_tokens.copy_to_gpu() # Hot-Swap lora model if self.lora_config: assert ( np.sum(num_sampled_tokens) <= self.vllm_config.scheduler_config.max_num_batched_tokens ) self.set_active_loras( self.input_batch, num_scheduled_tokens, num_sampled_tokens ) return ( logits_indices, spec_decode_metadata, ) def _build_attention_metadata( self, num_tokens: int, num_reqs: int, max_query_len: int, num_tokens_padded: int | None = None, num_reqs_padded: int | None = None, ubatch_slices: UBatchSlices | None = None, logits_indices: torch.Tensor | None = None, use_spec_decode: bool = False, for_cudagraph_capture: bool = False, num_scheduled_tokens: dict[str, int] | None = None, cascade_attn_prefix_lens: list[list[int]] | None = None, ) -> tuple[PerLayerAttnMetadata, CommonAttentionMetadata | None]: """ :return: tuple[attn_metadata, spec_decode_common_attn_metadata] """ # Attention metadata is not needed for attention free models if len(self.kv_cache_config.kv_cache_groups) == 0: return {}, None num_tokens_padded = num_tokens_padded or num_tokens num_reqs_padded = num_reqs_padded or num_reqs assert num_reqs_padded is not None and num_tokens_padded is not None attn_metadata: PerLayerAttnMetadata = {} if ubatch_slices is not None: attn_metadata = [dict() for _ in range(len(ubatch_slices))] if for_cudagraph_capture: # For some attention backends (e.g. FA) with sliding window models we need # to make sure the backend see a max_seq_len that is larger to the sliding # window size when capturing to make sure the correct kernel is selected. max_seq_len = self.max_model_len else: max_seq_len = self.seq_lens.np[:num_reqs].max().item() if use_spec_decode: self.num_accepted_tokens.np[:num_reqs] = ( self.input_batch.num_accepted_tokens_cpu[:num_reqs] ) self.num_accepted_tokens.np[num_reqs:].fill(1) self.num_accepted_tokens.copy_to_gpu() kv_cache_groups = self.kv_cache_config.kv_cache_groups def _get_block_table_and_slot_mapping(kv_cache_gid: int): assert num_reqs_padded is not None and num_tokens_padded is not None kv_cache_spec = kv_cache_groups[kv_cache_gid].kv_cache_spec if isinstance(kv_cache_spec, EncoderOnlyAttentionSpec): blk_table_tensor = torch.zeros( (num_reqs_padded, 1), dtype=torch.int32, device=self.device, ) slot_mapping = torch.zeros( (num_tokens_padded,), dtype=torch.int64, device=self.device, ) else: blk_table = self.input_batch.block_table[kv_cache_gid] blk_table_tensor = blk_table.get_device_tensor(num_reqs_padded) slot_mapping = blk_table.slot_mapping.gpu[:num_tokens_padded] # Fill unused with -1. Needed for reshape_and_cache in full cuda # graph mode. `blk_table_tensor` -1 to match mamba PAD_SLOT_ID slot_mapping[num_tokens:num_tokens_padded].fill_(-1) blk_table_tensor[num_reqs:num_reqs_padded].fill_(-1) return blk_table_tensor, slot_mapping block_table_gid_0, slot_mapping_gid_0 = _get_block_table_and_slot_mapping(0) cm_base = CommonAttentionMetadata( query_start_loc=self.query_start_loc.gpu[: num_reqs_padded + 1], query_start_loc_cpu=self.query_start_loc.cpu[: num_reqs_padded + 1], seq_lens=self.seq_lens.gpu[:num_reqs_padded], _seq_lens_cpu=self.seq_lens.cpu[:num_reqs_padded], _num_computed_tokens_cpu=self.input_batch.num_computed_tokens_cpu_tensor[ :num_reqs_padded ], num_reqs=num_reqs_padded, num_actual_tokens=num_tokens_padded, max_query_len=max_query_len, max_seq_len=max_seq_len, block_table_tensor=block_table_gid_0, slot_mapping=slot_mapping_gid_0, causal=True, ) if self.dcp_world_size > 1: self.dcp_local_seq_lens.cpu[:num_reqs] = get_dcp_local_seq_lens( self.seq_lens.cpu[:num_reqs], self.dcp_world_size, self.dcp_rank, self.parallel_config.cp_kv_cache_interleave_size, ) self.dcp_local_seq_lens.cpu[num_reqs:].fill_(0) self.dcp_local_seq_lens.copy_to_gpu(num_reqs_padded) cm_base.dcp_local_seq_lens = self.dcp_local_seq_lens.gpu[:num_reqs_padded] cm_base.dcp_local_seq_lens_cpu = self.dcp_local_seq_lens.cpu[ :num_reqs_padded ] if logits_indices is not None and self.cache_config.kv_sharing_fast_prefill: cm_base.num_logits_indices = logits_indices.size(0) cm_base.logits_indices_padded = self._prepare_kv_sharing_fast_prefill( logits_indices ) def _build_attn_group_metadata( kv_cache_gid: int, attn_gid: int, common_attn_metadata: CommonAttentionMetadata, ubid: int | None = None, ) -> None: attn_group = self.attn_groups[kv_cache_gid][attn_gid] cascade_attn_prefix_len = ( cascade_attn_prefix_lens[kv_cache_gid][attn_gid] if cascade_attn_prefix_lens else 0 ) builder = attn_group.get_metadata_builder(ubid or 0) extra_attn_metadata_args = {} if use_spec_decode and isinstance(builder, GDNAttentionMetadataBuilder): assert ubid is None, "UBatching not supported with GDN yet" extra_attn_metadata_args = dict( num_accepted_tokens=self.num_accepted_tokens.gpu[:num_reqs_padded], num_decode_draft_tokens_cpu=self.num_decode_draft_tokens.cpu[ :num_reqs_padded ], ) if for_cudagraph_capture: attn_metadata_i = builder.build_for_cudagraph_capture( common_attn_metadata ) else: attn_metadata_i = builder.build( common_prefix_len=cascade_attn_prefix_len, common_attn_metadata=common_attn_metadata, **extra_attn_metadata_args, ) if ubid is None: assert isinstance(attn_metadata, dict) attn_metadata_dict = attn_metadata else: assert isinstance(attn_metadata, list) attn_metadata_dict = attn_metadata[ubid] for layer_name in attn_group.layer_names: attn_metadata_dict[layer_name] = attn_metadata_i # Prepare the attention metadata for each KV cache group and make layers # in the same group share the same metadata. spec_decode_common_attn_metadata = None for kv_cache_gid, kv_cache_group in enumerate(kv_cache_groups): cm = copy(cm_base) # shallow copy # Basically only the encoder seq_lens, block_table and slot_mapping change # for each kv_cache_group. cm.encoder_seq_lens, cm.encoder_seq_lens_cpu = self._get_encoder_seq_lens( num_scheduled_tokens or {}, kv_cache_group.kv_cache_spec, num_reqs_padded, ) if kv_cache_gid > 0: cm.block_table_tensor, cm.slot_mapping = ( _get_block_table_and_slot_mapping(kv_cache_gid) ) if self.speculative_config and spec_decode_common_attn_metadata is None: if isinstance(self.drafter, EagleProposer): if self.drafter.attn_layer_names[0] in kv_cache_group.layer_names: spec_decode_common_attn_metadata = cm else: spec_decode_common_attn_metadata = cm for attn_gid in range(len(self.attn_groups[kv_cache_gid])): if ubatch_slices is not None: for ubid, _cm in enumerate(split_attn_metadata(ubatch_slices, cm)): _build_attn_group_metadata(kv_cache_gid, attn_gid, _cm, ubid) else: _build_attn_group_metadata(kv_cache_gid, attn_gid, cm) if self.is_mm_prefix_lm: req_doc_ranges = {} for req_id in self.input_batch.req_ids: image_doc_ranges = [] req_state = self.requests[req_id] for mm_feature in req_state.mm_features: pos_info = mm_feature.mm_position img_doc_range = pos_info.extract_embeds_range() image_doc_ranges.extend(img_doc_range) req_idx = self.input_batch.req_id_to_index[req_id] req_doc_ranges[req_idx] = image_doc_ranges if isinstance(attn_metadata, list): for ub_metadata in attn_metadata: for _metadata in ub_metadata.values(): _metadata.mm_prefix_range = req_doc_ranges # type: ignore[attr-defined] else: for _metadata in attn_metadata.values(): _metadata.mm_prefix_range = req_doc_ranges # type: ignore[attr-defined] if spec_decode_common_attn_metadata is not None and ( num_reqs != num_reqs_padded or num_tokens != num_tokens_padded ): # Currently the drafter still only uses piecewise cudagraphs (and modifies # the attention metadata in directly), and therefore does not want to use # padded attention metadata. spec_decode_common_attn_metadata = ( spec_decode_common_attn_metadata.unpadded(num_tokens, num_reqs) ) return attn_metadata, spec_decode_common_attn_metadata def _compute_cascade_attn_prefix_lens( self, num_scheduled_tokens: np.ndarray, num_computed_tokens: np.ndarray, num_common_prefix_blocks: list[int], ) -> list[list[int]] | None: """ :return: Optional[cascade_attn_prefix_lens] cascade_attn_prefix_lens is 2D: ``[kv_cache_group_id][attn_group_idx]``, None if we should not use cascade attention """ use_cascade_attn = False num_kv_cache_groups = len(self.kv_cache_config.kv_cache_groups) cascade_attn_prefix_lens: list[list[int]] = [ [] for _ in range(num_kv_cache_groups) ] for kv_cache_gid in range(num_kv_cache_groups): for attn_group in self.attn_groups[kv_cache_gid]: if isinstance(attn_group.kv_cache_spec, EncoderOnlyAttentionSpec): cascade_attn_prefix_len = 0 else: # 0 if cascade attention should not be used cascade_attn_prefix_len = self._compute_cascade_attn_prefix_len( num_scheduled_tokens, num_computed_tokens, num_common_prefix_blocks[kv_cache_gid], attn_group.kv_cache_spec, attn_group.get_metadata_builder(), ) cascade_attn_prefix_lens[kv_cache_gid].append(cascade_attn_prefix_len) use_cascade_attn |= cascade_attn_prefix_len > 0 return cascade_attn_prefix_lens if use_cascade_attn else None def _compute_cascade_attn_prefix_len( self, num_scheduled_tokens: np.ndarray, num_computed_tokens: np.ndarray, num_common_prefix_blocks: int, kv_cache_spec: KVCacheSpec, attn_metadata_builder: AttentionMetadataBuilder, ) -> int: """Compute the length of the common prefix for cascade attention. NOTE(woosuk): The common prefix length returned by this function represents the length used specifically for cascade attention, not the actual number of tokens shared between requests. When cascade attention is disabled (use_cascade=False), this function returns 0 even if requests share common tokens. Additionally, the common prefix length is truncated to a multiple of the block size and may be further truncated due to implementation details explained below. Args: num_scheduled_tokens: Number of tokens scheduled per request. num_common_prefix_blocks: Number of shared KV cache blocks. Returns: int: Length of common prefix in tokens. """ common_prefix_len = num_common_prefix_blocks * kv_cache_spec.block_size if common_prefix_len == 0: # Common case. return 0 # NOTE(woosuk): Cascade attention uses two attention kernels: one # for the common prefix and the other for the rest. For the first # kernel, we concatenate all the query tokens (possibly from # different requests) and treat them as if they are from the same # request. Then, we use bi-directional attention to process the # common prefix in the KV cache. Importantly, this means that the # first kernel does not do any masking. # Consider the following example: # Request 1's input query: [D, E, X] # Request 1's kv cache: [A, B, C, D, E, X] # Request 1's num_computed_tokens: 3 (i.e., [A, B, C]) # Request 2's input query: [E, Y] # Request 2's kv cache: [A, B, C, D, E, Y] # Request 2's num_computed_tokens: 4 (i.e., [A, B, C, D]) # If we use [A, B, C, D, E] as the common prefix, then the # first kernel will compute the bi-directional attention between # input query [D, E, X, E, Y] and common prefix [A, B, C, D, E]. # However, this is wrong because D in Request 1 should not attend to # E in the common prefix (i.e., we need masking). # To avoid this, [A, B, C, D] should be the common prefix. # That is, the common prefix should be capped by the minimum # num_computed_tokens among the requests, and plus one to include # the first token of the query. # In practice, we use [A, B, C] as the common prefix, instead of # [A, B, C, D] (i.e., the common prefix is capped by the minimum # num_computed_tokens, without plus one). # This is because of an implementation detail: We want to always # use two kernels for cascade attention. Let's imagine: # Request 3's input query: [D] # Request 3's kv cache: [A, B, C, D] # Request 3's num_computed_tokens: 3 (i.e., [A, B, C]) # If we use [A, B, C, D] as the common prefix for Request 1-3, # then Request 3 will be processed only by the first kernel, # and the second kernel will get an empty input. While this is not # a fundamental problem, our current implementation does not support # this case. common_prefix_len = min(common_prefix_len, num_computed_tokens.min()) # common_prefix_len should be a multiple of the block size. common_prefix_len = ( common_prefix_len // kv_cache_spec.block_size * kv_cache_spec.block_size ) use_sliding_window = isinstance(kv_cache_spec, SlidingWindowSpec) or ( isinstance(kv_cache_spec, FullAttentionSpec) and kv_cache_spec.sliding_window is not None ) use_local_attention = isinstance(kv_cache_spec, ChunkedLocalAttentionSpec) or ( isinstance(kv_cache_spec, FullAttentionSpec) and kv_cache_spec.attention_chunk_size is not None ) assert isinstance(kv_cache_spec, AttentionSpec) use_cascade = attn_metadata_builder.use_cascade_attention( common_prefix_len=common_prefix_len, query_lens=num_scheduled_tokens, num_query_heads=self.num_query_heads, num_kv_heads=kv_cache_spec.num_kv_heads, use_alibi=self.use_alibi, use_sliding_window=use_sliding_window, use_local_attention=use_local_attention, num_sms=self.num_sms, dcp_world_size=self.dcp_world_size, ) return common_prefix_len if use_cascade else 0 def _calc_mrope_positions(self, scheduler_output: "SchedulerOutput"): mrope_pos_ptr = 0 for index, req_id in enumerate(self.input_batch.req_ids): req = self.requests[req_id] assert req.mrope_positions is not None num_computed_tokens = self.input_batch.num_computed_tokens_cpu[index] num_scheduled_tokens = scheduler_output.num_scheduled_tokens[req_id] num_prompt_tokens = length_from_prompt_token_ids_or_embeds( req.prompt_token_ids, req.prompt_embeds ) if num_computed_tokens + num_scheduled_tokens > num_prompt_tokens: prompt_part_len = max(0, num_prompt_tokens - num_computed_tokens) completion_part_len = max(0, num_scheduled_tokens - prompt_part_len) else: prompt_part_len = num_scheduled_tokens completion_part_len = 0 assert num_scheduled_tokens == prompt_part_len + completion_part_len if prompt_part_len > 0: # prompt's mrope_positions are pre-computed dst_start = mrope_pos_ptr dst_end = mrope_pos_ptr + prompt_part_len src_start = num_computed_tokens src_end = num_computed_tokens + prompt_part_len self.mrope_positions.cpu[:, dst_start:dst_end] = req.mrope_positions[ :, src_start:src_end ] mrope_pos_ptr += prompt_part_len if completion_part_len > 0: # compute completion's mrope_positions on-the-fly dst_start = mrope_pos_ptr dst_end = mrope_pos_ptr + completion_part_len assert req.mrope_position_delta is not None MRotaryEmbedding.get_next_input_positions_tensor( out=self.mrope_positions.np, out_offset=dst_start, mrope_position_delta=req.mrope_position_delta, context_len=num_computed_tokens + prompt_part_len, num_new_tokens=completion_part_len, ) mrope_pos_ptr += completion_part_len def _calc_xdrope_positions(self, scheduler_output: "SchedulerOutput"): xdrope_pos_ptr = 0 for index, req_id in enumerate(self.input_batch.req_ids): req = self.requests[req_id] assert req.xdrope_positions is not None num_computed_tokens = self.input_batch.num_computed_tokens_cpu[index] num_scheduled_tokens = scheduler_output.num_scheduled_tokens[req_id] num_prompt_tokens = length_from_prompt_token_ids_or_embeds( req.prompt_token_ids, req.prompt_embeds ) if num_computed_tokens + num_scheduled_tokens > num_prompt_tokens: prompt_part_len = max(0, num_prompt_tokens - num_computed_tokens) completion_part_len = max(0, num_scheduled_tokens - prompt_part_len) else: prompt_part_len = num_scheduled_tokens completion_part_len = 0 assert num_scheduled_tokens == prompt_part_len + completion_part_len if prompt_part_len > 0: # prompt's xdrope_positions are pre-computed dst_start = xdrope_pos_ptr dst_end = xdrope_pos_ptr + prompt_part_len src_start = num_computed_tokens src_end = num_computed_tokens + prompt_part_len self.xdrope_positions.cpu[:, dst_start:dst_end] = req.xdrope_positions[ :, src_start:src_end ] xdrope_pos_ptr += prompt_part_len if completion_part_len > 0: # compute completion's xdrope_positions on-the-fly dst_start = xdrope_pos_ptr dst_end = xdrope_pos_ptr + completion_part_len XDRotaryEmbedding.get_next_input_positions_tensor( out=self.xdrope_positions.np, out_offset=dst_start, context_len=num_computed_tokens + prompt_part_len, num_new_tokens=completion_part_len, ) xdrope_pos_ptr += completion_part_len def _calc_spec_decode_metadata( self, num_draft_tokens: np.ndarray, cu_num_scheduled_tokens: np.ndarray, ) -> SpecDecodeMetadata: # Inputs: # cu_num_scheduled_tokens: [ 4, 104, 107, 207, 209] # num_draft_tokens: [ 3, 0, 2, 0, 1] # Outputs: # cu_num_draft_tokens: [ 3, 3, 5, 5, 6] # logits_indices: [ 0, 1, 2, 3, 103, 104, 105, 106, # 206, 207, 208] # target_logits_indices: [ 0, 1, 2, 5, 6, 9] # bonus_logits_indices: [ 3, 4, 7, 8, 10] # Compute the logits indices. # [4, 1, 3, 1, 2] num_sampled_tokens = num_draft_tokens + 1 # Step 1. cu_num_sampled_tokens: [4, 5, 8, 9, 11] # arange: [0, 1, 2, 3, 0, 0, 1, 2, 0, 0, 1] cu_num_sampled_tokens, arange = self._get_cumsum_and_arange( num_sampled_tokens, cumsum_dtype=np.int32 ) # Step 2. [0, 0, 0, 0, 103, 104, 104, 104, 206, 207, 207] logits_indices = np.repeat( cu_num_scheduled_tokens - num_sampled_tokens, num_sampled_tokens ) # Step 3. [0, 1, 2, 3, 103, 104, 105, 106, 206, 207, 208] logits_indices += arange # Compute the bonus logits indices. bonus_logits_indices = cu_num_sampled_tokens - 1 # Compute the draft logits indices. # cu_num_draft_tokens: [3, 3, 5, 5, 6] # arange: [0, 1, 2, 0, 1, 0] cu_num_draft_tokens, arange = self._get_cumsum_and_arange( num_draft_tokens, cumsum_dtype=np.int32 ) # [0, 0, 0, 5, 5, 9] target_logits_indices = np.repeat( cu_num_sampled_tokens - num_sampled_tokens, num_draft_tokens ) # [0, 1, 2, 5, 6, 9] target_logits_indices += arange # TODO: Optimize the CPU -> GPU copy. cu_num_draft_tokens = torch.from_numpy(cu_num_draft_tokens).to( self.device, non_blocking=True ) cu_num_sampled_tokens = torch.from_numpy(cu_num_sampled_tokens).to( self.device, non_blocking=True ) logits_indices = torch.from_numpy(logits_indices).to( self.device, non_blocking=True ) target_logits_indices = torch.from_numpy(target_logits_indices).to( self.device, non_blocking=True ) bonus_logits_indices = torch.from_numpy(bonus_logits_indices).to( self.device, non_blocking=True ) # Compute the draft token ids. # draft_token_indices: [ 1, 2, 3, 105, 106, 208] draft_token_ids = self.input_ids.gpu[logits_indices] draft_token_ids = draft_token_ids[target_logits_indices + 1] return SpecDecodeMetadata( draft_token_ids=draft_token_ids, num_draft_tokens=num_draft_tokens.tolist(), cu_num_draft_tokens=cu_num_draft_tokens, cu_num_sampled_tokens=cu_num_sampled_tokens, target_logits_indices=target_logits_indices, bonus_logits_indices=bonus_logits_indices, logits_indices=logits_indices, ) def _prepare_kv_sharing_fast_prefill( self, logits_indices: torch.Tensor, ) -> torch.Tensor: assert self.kv_sharing_fast_prefill_logits_indices is not None num_logits = logits_indices.shape[0] assert num_logits > 0 self.kv_sharing_fast_prefill_logits_indices[:num_logits].copy_(logits_indices) # There might have leftover indices in logits_indices[num_logits:] # from previous iterations, whose values may be greater than the # batch size in the current iteration. To ensure indices are always # valid, we fill the padded indices with the last index. self.kv_sharing_fast_prefill_logits_indices[num_logits:].fill_( logits_indices[-1].item() ) if ( self.compilation_config.cudagraph_mode != CUDAGraphMode.NONE and num_logits <= self.cudagraph_batch_sizes[-1] ): # Use piecewise CUDA graphs. # Add padding to the batch size. num_logits_padded = self.vllm_config.pad_for_cudagraph(num_logits) else: num_logits_padded = num_logits logits_indices_padded = self.kv_sharing_fast_prefill_logits_indices[ :num_logits_padded ] return logits_indices_padded def _batch_mm_kwargs_from_scheduler( self, scheduler_output: "SchedulerOutput", ) -> tuple[list[MultiModalKwargsItem], list[tuple[str, PlaceholderRange]]]: """Batch multimodal kwargs from scheduled encoder inputs. Args: scheduler_output: The scheduler output containing scheduled encoder inputs. Returns: A tuple of (mm_kwargs, req_ids_pos) where: - mm_kwargs: List of multimodal kwargs items to be batched - mm_hashes_pos: List of (mm_hash, position_info) tuples """ scheduled_encoder_inputs = scheduler_output.scheduled_encoder_inputs if not scheduled_encoder_inputs: return [], [] # Batch the multi-modal inputs. mm_kwargs = list[MultiModalKwargsItem]() # list of tuple (mm_hash, position_info) mm_hashes_pos = list[tuple[str, PlaceholderRange]]() for req_id, encoder_input_ids in scheduled_encoder_inputs.items(): req_state = self.requests[req_id] for mm_input_id in encoder_input_ids: mm_feature = req_state.mm_features[mm_input_id] if mm_feature.data is None: continue mm_hash = mm_feature.identifier mm_kwargs.append(mm_feature.data) mm_hashes_pos.append((mm_hash, mm_feature.mm_position)) return mm_kwargs, mm_hashes_pos def _execute_mm_encoder( self, scheduler_output: "SchedulerOutput" ) -> list[torch.Tensor]: # Batch the multi-modal inputs using the helper method. mm_kwargs, mm_hashes_pos = self._batch_mm_kwargs_from_scheduler( scheduler_output ) if not mm_kwargs: return [] # Batch mm inputs as much as we can: if a request in the batch has # multiple modalities or a different modality than the previous one, # we process it separately to preserve item order. # FIXME(ywang96): This is a hacky way to deal with multiple modalities # in the same batch while still being able to benefit from batching # multimodal inputs. The proper solution should be reordering the # encoder outputs. model = cast(SupportsMultiModal, self.model) encoder_outputs: list[torch.Tensor] = [] for modality, num_items, mm_kwargs_group in group_mm_kwargs_by_modality( mm_kwargs, device=self.device, pin_memory=self.pin_memory, ): curr_group_outputs: list[torch.Tensor] = [] # EVS-related change. # (ekhvedchenia): Temporary hack to limit peak memory usage when # processing multimodal data. This solves the issue with scheduler # putting too many video samples into a single batch. Scheduler # uses pruned vision tokens count to compare it versus compute # budget which is incorrect (Either input media size or non-pruned # output vision tokens count should be considered) # TODO(ywang96): Fix memory profiling to take EVS into account and # remove this hack. if ( self.is_multimodal_pruning_enabled and modality == "video" and num_items > 1 ): for video_mm_kwargs_item in filter( lambda item: item.modality == "video", mm_kwargs ): _, _, micro_batch_mm_inputs = next( group_mm_kwargs_by_modality( [video_mm_kwargs_item], device=self.device, pin_memory=self.pin_memory, ) ) micro_batch_outputs = model.embed_multimodal( **micro_batch_mm_inputs ) curr_group_outputs.extend(micro_batch_outputs) else: # Run the encoder. # `curr_group_outputs` is either of the following: # 1. A tensor of shape (num_items, feature_size, hidden_size) # in case feature_size is fixed across all multimodal items. # 2. A list or tuple (length: num_items) of tensors, # each of shape (feature_size, hidden_size) in case the feature # size is dynamic depending on the input multimodal items. curr_group_outputs = model.embed_multimodal(**mm_kwargs_group) # type: ignore[assignment] sanity_check_mm_encoder_outputs( curr_group_outputs, expected_num_items=num_items, ) encoder_outputs.extend(curr_group_outputs) # Cache the encoder outputs by mm_hash for (mm_hash, pos_info), output in zip(mm_hashes_pos, encoder_outputs): self.encoder_cache[mm_hash] = output logger.debug("Finish execute for mm hash %s", mm_hash) self.maybe_save_ec_to_connector(self.encoder_cache, mm_hash) return encoder_outputs def _gather_mm_embeddings( self, scheduler_output: "SchedulerOutput", shift_computed_tokens: int = 0, ) -> tuple[list[torch.Tensor], torch.Tensor]: total_num_scheduled_tokens = scheduler_output.total_num_scheduled_tokens mm_embeds = list[torch.Tensor]() is_mm_embed = self.is_mm_embed.cpu is_mm_embed[:total_num_scheduled_tokens] = False req_start_idx = 0 should_sync_mrope_positions = False should_sync_xdrope_positions = False for req_id in self.input_batch.req_ids: mm_embeds_req: list[torch.Tensor] = [] num_scheduled_tokens = scheduler_output.num_scheduled_tokens[req_id] req_state = self.requests[req_id] num_computed_tokens = req_state.num_computed_tokens + shift_computed_tokens for mm_feature in req_state.mm_features: pos_info = mm_feature.mm_position start_pos = pos_info.offset num_encoder_tokens = pos_info.length # The encoder output is needed if the two ranges overlap: # [num_computed_tokens, # num_computed_tokens + num_scheduled_tokens) and # [start_pos, start_pos + num_encoder_tokens) if start_pos >= num_computed_tokens + num_scheduled_tokens: # The encoder output is not needed in this step. break if start_pos + num_encoder_tokens <= num_computed_tokens: # The encoder output is already processed and stored # in the decoder's KV cache. continue start_idx = max(num_computed_tokens - start_pos, 0) end_idx = min( num_computed_tokens - start_pos + num_scheduled_tokens, num_encoder_tokens, ) assert start_idx < end_idx curr_embeds_start, curr_embeds_end = ( pos_info.get_embeds_indices_in_range(start_idx, end_idx) ) # If there are no embeddings in the current range, we skip # gathering the embeddings. if curr_embeds_start == curr_embeds_end: continue mm_hash = mm_feature.identifier encoder_output = self.encoder_cache.get(mm_hash, None) assert encoder_output is not None, f"Encoder cache miss for {mm_hash}." if (is_embed := pos_info.is_embed) is not None: is_embed = is_embed[start_idx:end_idx] mm_embeds_item = encoder_output[curr_embeds_start:curr_embeds_end] else: mm_embeds_item = encoder_output[start_idx:end_idx] req_start_pos = req_start_idx + start_pos - num_computed_tokens is_mm_embed[req_start_pos + start_idx : req_start_pos + end_idx] = ( True if is_embed is None else is_embed ) mm_embeds_req.append(mm_embeds_item) if self.is_multimodal_pruning_enabled and self.uses_mrope: assert req_state.mrope_positions is not None should_sync_mrope_positions = True mm_embeds_req, new_mrope_positions, new_delta = ( self.model.recompute_mrope_positions( input_ids=req_state.prompt_token_ids, multimodal_embeddings=mm_embeds_req, mrope_positions=req_state.mrope_positions, num_computed_tokens=req_state.num_computed_tokens, ) ) req_state.mrope_positions.copy_(new_mrope_positions) req_state.mrope_position_delta = new_delta mm_embeds.extend(mm_embeds_req) req_start_idx += num_scheduled_tokens is_mm_embed = self.is_mm_embed.copy_to_gpu(total_num_scheduled_tokens) if should_sync_mrope_positions: self._calc_mrope_positions(scheduler_output) self.mrope_positions.copy_to_gpu(total_num_scheduled_tokens) if should_sync_xdrope_positions: self._calc_xdrope_positions(scheduler_output) self.xdrope_positions.copy_to_gpu(total_num_scheduled_tokens) return mm_embeds, is_mm_embed def get_model(self) -> nn.Module: # get raw model out of the cudagraph wrapper. if isinstance(self.model, (CUDAGraphWrapper, UBatchWrapper)): return self.model.unwrap() return self.model def get_supported_generation_tasks(self) -> list[GenerationTask]: model = self.get_model() supported_tasks = list[GenerationTask]() if is_text_generation_model(model): supported_tasks.append("generate") if supports_transcription(model): if model.supports_transcription_only: return ["transcription"] supported_tasks.append("transcription") return supported_tasks def get_supported_pooling_tasks(self) -> list[PoolingTask]: model = self.get_model() if not is_pooling_model(model): return [] supported_tasks = list(model.pooler.get_supported_tasks()) if "score" in supported_tasks: num_labels = getattr(self.model_config.hf_config, "num_labels", 0) if num_labels != 1: supported_tasks.remove("score") logger.debug_once("Score API is only enabled for num_labels == 1.") return supported_tasks def get_supported_tasks(self) -> tuple[SupportedTask, ...]: tasks = list[SupportedTask]() if self.model_config.runner_type == "generate": tasks.extend(self.get_supported_generation_tasks()) if self.model_config.runner_type == "pooling": tasks.extend(self.get_supported_pooling_tasks()) return tuple(tasks) def sync_and_slice_intermediate_tensors( self, num_tokens: int, intermediate_tensors: IntermediateTensors | None, sync_self: bool, ) -> IntermediateTensors: assert self.intermediate_tensors is not None tp = self.vllm_config.parallel_config.tensor_parallel_size is_rs = is_residual_scattered_for_sp(self.vllm_config, num_tokens) # When sequence parallelism is enabled, the "residual" tensor is sharded # across tensor parallel ranks, so each rank only needs its own slice. if sync_self: assert intermediate_tensors is not None for k, v in intermediate_tensors.items(): is_scattered = k == "residual" and is_rs copy_len = num_tokens // tp if is_scattered else num_tokens self.intermediate_tensors[k][:copy_len].copy_( v[:copy_len], non_blocking=True ) return IntermediateTensors( { k: v[: num_tokens // tp] if k == "residual" and is_rs else v[:num_tokens] for k, v in self.intermediate_tensors.items() } ) def eplb_step(self, is_dummy: bool = False, is_profile: bool = False) -> None: """ Step for the EPLB (Expert Parallelism Load Balancing) state. """ if not self.parallel_config.enable_eplb: return assert self.eplb_state is not None model = self.get_model() assert is_mixture_of_experts(model) self.eplb_state.step( is_dummy, is_profile, log_stats=self.parallel_config.eplb_config.log_balancedness, ) def _pool( self, hidden_states: torch.Tensor, num_scheduled_tokens: int, num_scheduled_tokens_np: np.ndarray, ) -> ModelRunnerOutput: assert self.input_batch.num_reqs == len(self.input_batch.pooling_params), ( "Either all or none of the requests in a batch must be pooling request" ) hidden_states = hidden_states[:num_scheduled_tokens] seq_lens_cpu = self.seq_lens.cpu[: self.input_batch.num_reqs] pooling_metadata = self.input_batch.get_pooling_metadata() pooling_metadata.build_pooling_cursor( num_scheduled_tokens_np.tolist(), seq_lens_cpu, device=hidden_states.device ) model = cast(VllmModelForPooling, self.model) raw_pooler_output: PoolerOutput = model.pooler( hidden_states=hidden_states, pooling_metadata=pooling_metadata, ) raw_pooler_output = json_map_leaves( lambda x: x.to("cpu", non_blocking=True) if x is not None else x, raw_pooler_output, ) self._sync_device() pooler_output: list[torch.Tensor | None] = [] for raw_output, seq_len, prompt_len in zip( raw_pooler_output, seq_lens_cpu, pooling_metadata.prompt_lens ): output = raw_output if seq_len == prompt_len else None pooler_output.append(output) return ModelRunnerOutput( req_ids=self.input_batch.req_ids, req_id_to_index=self.input_batch.req_id_to_index, sampled_token_ids=[], logprobs=None, prompt_logprobs_dict={}, pooler_output=pooler_output, ) def _pad_for_sequence_parallelism(self, num_scheduled_tokens: int) -> int: # Pad tokens to multiple of tensor_parallel_size when # enabled collective fusion for SP tp_size = self.vllm_config.parallel_config.tensor_parallel_size if self.compilation_config.pass_config.enable_sp and tp_size > 1: return round_up(num_scheduled_tokens, tp_size) return num_scheduled_tokens def _preprocess( self, scheduler_output: "SchedulerOutput", num_input_tokens: int, # Padded intermediate_tensors: IntermediateTensors | None = None, ) -> tuple[ torch.Tensor | None, torch.Tensor | None, torch.Tensor, IntermediateTensors | None, dict[str, Any], ECConnectorOutput | None, ]: num_scheduled_tokens = scheduler_output.total_num_scheduled_tokens is_first_rank = get_pp_group().is_first_rank is_encoder_decoder = self.model_config.is_encoder_decoder # _prepare_inputs may reorder the batch, so we must gather multi # modal outputs after that to ensure the correct order ec_connector_output = None if self.supports_mm_inputs and is_first_rank and not is_encoder_decoder: # Run the multimodal encoder if any. with self.maybe_get_ec_connector_output( scheduler_output, encoder_cache=self.encoder_cache, ) as ec_connector_output: self._execute_mm_encoder(scheduler_output) mm_embeds, is_mm_embed = self._gather_mm_embeddings(scheduler_output) # NOTE(woosuk): To unify token ids and soft tokens (vision # embeddings), we always use embeddings (rather than token ids) # as input to the multimodal model, even when the input is text. inputs_embeds_scheduled = self.model.embed_input_ids( self.input_ids.gpu[:num_scheduled_tokens], multimodal_embeddings=mm_embeds, is_multimodal=is_mm_embed, ) # TODO(woosuk): Avoid the copy. Optimize. self.inputs_embeds.gpu[:num_scheduled_tokens].copy_(inputs_embeds_scheduled) input_ids = None inputs_embeds = self.inputs_embeds.gpu[:num_input_tokens] model_kwargs = { **self._init_model_kwargs(num_scheduled_tokens), **self._extract_mm_kwargs(scheduler_output), } elif self.enable_prompt_embeds and is_first_rank: # Get the input embeddings for the tokens that are not input embeds, # then put them into the appropriate positions. # TODO(qthequartermasterman): Since even when prompt embeds are # enabled, (a) not all requests will use prompt embeds, and (b) # after the initial prompt is processed, the rest of the generated # tokens will be token ids, it is not desirable to have the # embedding layer outside of the CUDA graph all the time. The v0 # engine avoids this by "double compiling" the CUDA graph, once # with input_ids and again with inputs_embeds, for all num_tokens. # If a batch only has token ids, then including the embedding layer # in the CUDA graph will be more performant (like in the else case # below). token_ids_idx = ( self.is_token_ids.gpu[:num_scheduled_tokens] .nonzero(as_tuple=False) .squeeze(1) ) # Some tokens ids may need to become embeds if token_ids_idx.numel() > 0: token_ids = self.input_ids.gpu[token_ids_idx] tokens_to_embeds = self.model.embed_input_ids(input_ids=token_ids) self.inputs_embeds.gpu[token_ids_idx] = tokens_to_embeds inputs_embeds = self.inputs_embeds.gpu[:num_input_tokens] model_kwargs = self._init_model_kwargs(num_input_tokens) input_ids = None else: # For text-only models, we use token ids as input. # While it is possible to use embeddings as input just like the # multimodal models, it is not desirable for performance since # then the embedding layer is not included in the CUDA graph. input_ids = self.input_ids.gpu[:num_input_tokens] inputs_embeds = None model_kwargs = self._init_model_kwargs(num_input_tokens) if self.uses_mrope: positions = self.mrope_positions.gpu[:, :num_input_tokens] elif self.uses_xdrope_dim > 0: positions = self.xdrope_positions.gpu[:, :num_input_tokens] else: positions = self.positions.gpu[:num_input_tokens] if is_first_rank: intermediate_tensors = None else: assert intermediate_tensors is not None intermediate_tensors = self.sync_and_slice_intermediate_tensors( num_input_tokens, intermediate_tensors, True ) if is_encoder_decoder and scheduler_output.scheduled_encoder_inputs: # Run the encoder, just like we do with other multimodal inputs. # For an encoder-decoder model, our processing here is a bit # simpler, because the outputs are just passed to the decoder. # We are not doing any prompt replacement. We also will only # ever have a single encoder input. encoder_outputs = self._execute_mm_encoder(scheduler_output) model_kwargs.update({"encoder_outputs": encoder_outputs}) return ( input_ids, inputs_embeds, positions, intermediate_tensors, model_kwargs, ec_connector_output, ) def _sample( self, logits: torch.Tensor | None, spec_decode_metadata: SpecDecodeMetadata | None, ) -> SamplerOutput: # Sample the next token and get logprobs if needed. sampling_metadata = self.input_batch.sampling_metadata if spec_decode_metadata is None: # Update output token ids with tokens sampled in last step # if async scheduling and required by current sampling params. self.input_batch.update_async_output_token_ids() return self.sampler( logits=logits, sampling_metadata=sampling_metadata, ) sampler_output = self.rejection_sampler( spec_decode_metadata, None, # draft_probs logits, sampling_metadata, ) self._update_states_after_model_execute(sampler_output.sampled_token_ids) return sampler_output def _bookkeeping_sync( self, scheduler_output: "SchedulerOutput", sampler_output: SamplerOutput, logits: torch.Tensor | None, hidden_states: torch.Tensor, num_scheduled_tokens: int, spec_decode_metadata: SpecDecodeMetadata | None, ) -> tuple[ dict[str, int], LogprobsLists | None, list[list[int]], dict[str, LogprobsTensors | None], list[str], dict[str, int], list[int], ]: num_nans_in_logits = {} if envs.VLLM_COMPUTE_NANS_IN_LOGITS: num_nans_in_logits = self._get_nans_in_logits(logits) num_reqs = self.input_batch.num_reqs discard_sampled_tokens_req_indices = np.nonzero( self.discard_request_mask.np[:num_reqs] )[0] for i in discard_sampled_tokens_req_indices: gen = self.input_batch.generators.get(int(i)) if gen is not None: gen.set_offset(gen.get_offset() - 4) # Copy some objects so they don't get modified after returning. # This is important when using async scheduling. req_ids_output_copy = self.input_batch.req_ids.copy() req_id_to_index_output_copy = self.input_batch.req_id_to_index.copy() num_sampled_tokens = sampler_output.sampled_token_ids.shape[0] sampled_token_ids = sampler_output.sampled_token_ids logprobs_tensors = sampler_output.logprobs_tensors invalid_req_indices = [] cu_num_tokens: list[int] | None = None if not self.use_async_scheduling: # Get the valid generated tokens. max_gen_len = sampled_token_ids.shape[-1] if max_gen_len == 1: # No spec decode tokens. valid_sampled_token_ids = self._to_list(sampled_token_ids) # Mask out the sampled tokens that should not be sampled. for i in discard_sampled_tokens_req_indices: valid_sampled_token_ids[int(i)].clear() else: # Includes spec decode tokens. valid_sampled_token_ids, cu_num_tokens = RejectionSampler.parse_output( sampled_token_ids, self.input_batch.vocab_size, discard_sampled_tokens_req_indices, return_cu_num_tokens=logprobs_tensors is not None, ) else: valid_sampled_token_ids = [] invalid_req_indices = discard_sampled_tokens_req_indices.tolist() invalid_req_indices_set = set(invalid_req_indices) # Cache the sampled tokens on the GPU and avoid CPU sync. # These will be copied into input_ids in the next step # when preparing inputs. # With spec decoding, this is done in propose_draft_token_ids(). if self.input_batch.prev_sampled_token_ids is None: assert sampled_token_ids.shape[-1] == 1 self.input_batch.prev_sampled_token_ids = sampled_token_ids self.input_batch.prev_req_id_to_index = { req_id: i for i, req_id in enumerate(self.input_batch.req_ids) if i not in invalid_req_indices_set } # Cache the sampled tokens in the model runner, so that the scheduler # doesn't need to send them back. # NOTE(woosuk): As an exception, when using PP, the scheduler sends # the sampled tokens back, because there's no direct communication # between the first-stage worker and the last-stage worker. req_ids = self.input_batch.req_ids for req_idx in range(num_sampled_tokens): if self.use_async_scheduling: sampled_ids = [-1] if req_idx not in invalid_req_indices_set else None else: sampled_ids = valid_sampled_token_ids[req_idx] num_sampled_ids: int = len(sampled_ids) if sampled_ids else 0 if not sampled_ids: continue start_idx = self.input_batch.num_tokens_no_spec[req_idx] end_idx = start_idx + num_sampled_ids assert end_idx <= self.max_model_len, ( "Sampled token IDs exceed the max model length. " f"Total number of tokens: {end_idx} > max_model_len: " f"{self.max_model_len}" ) self.input_batch.token_ids_cpu[req_idx, start_idx:end_idx] = sampled_ids self.input_batch.is_token_ids[req_idx, start_idx:end_idx] = True self.input_batch.num_tokens_no_spec[req_idx] = end_idx self.input_batch.num_tokens[req_idx] = end_idx req_id = req_ids[req_idx] req_state = self.requests[req_id] req_state.output_token_ids.extend(sampled_ids) logprobs_lists = ( logprobs_tensors.tolists(cu_num_tokens) if not self.use_async_scheduling and logprobs_tensors is not None else None ) # Compute prompt logprobs if needed. prompt_logprobs_dict = self._get_prompt_logprobs_dict( hidden_states[:num_scheduled_tokens], scheduler_output.num_scheduled_tokens, ) return ( num_nans_in_logits, logprobs_lists, valid_sampled_token_ids, prompt_logprobs_dict, req_ids_output_copy, req_id_to_index_output_copy, invalid_req_indices, ) @contextmanager def synchronize_input_prep(self): if self.prepare_inputs_event is None: yield return # Ensure prior step has finished with reused CPU tensors. # This is required in the async scheduling case because # the CPU->GPU transfer happens async. self.prepare_inputs_event.synchronize() try: yield finally: self.prepare_inputs_event.record() def _model_forward( self, input_ids: torch.Tensor | None = None, positions: torch.Tensor | None = None, intermediate_tensors: IntermediateTensors | None = None, inputs_embeds: torch.Tensor | None = None, **model_kwargs: dict[str, Any], ) -> Any: """Helper method to call the model forward pass. This method can be overridden by subclasses for model execution. Motivation: We can inspect only this method versus the whole execute_model, which has additional logic. Args: input_ids: Input token IDs positions: Token positions intermediate_tensors: Tensors from previous pipeline stages inputs_embeds: Input embeddings (alternative to input_ids) **model_kwargs: Additional model arguments Returns: Model output tensor """ return self.model( input_ids=input_ids, positions=positions, intermediate_tensors=intermediate_tensors, inputs_embeds=inputs_embeds, **model_kwargs, ) def _determine_batch_execution_and_padding( self, num_tokens: int, num_reqs: int, num_scheduled_tokens_np: np.ndarray, max_num_scheduled_tokens: int, use_cascade_attn: bool, allow_microbatching: bool = True, force_eager: bool = False, # For cudagraph capture TODO(lucas): Refactor how we capture cudagraphs (will # be improved in model runner v2) force_uniform_decode: bool | None = None, force_has_lora: bool | None = None, num_encoder_reqs: int = 0, ) -> tuple[ CUDAGraphMode, BatchDescriptor, bool, torch.Tensor | None, CUDAGraphStat | None, ]: num_tokens_padded = self._pad_for_sequence_parallelism(num_tokens) uniform_decode = ( ( (max_num_scheduled_tokens == self.uniform_decode_query_len) and (num_tokens_padded == max_num_scheduled_tokens * num_reqs) ) if force_uniform_decode is None else force_uniform_decode ) # Encoder-decoder models only support CG for decoder_step > 0 (no enc_output # is present). Also, chunked-prefill is disabled, so batch are uniform. has_encoder_output = ( self.model_config.is_encoder_decoder and num_encoder_reqs > 0 ) has_lora = ( len(self.input_batch.lora_id_to_lora_request) > 0 if force_has_lora is None else force_has_lora ) dispatch_cudagraph = ( lambda num_tokens, disable_full: self.cudagraph_dispatcher.dispatch( num_tokens=num_tokens, has_lora=has_lora, uniform_decode=uniform_decode, disable_full=disable_full, ) if not force_eager else (CUDAGraphMode.NONE, BatchDescriptor(num_tokens_padded)) ) cudagraph_mode, batch_descriptor = dispatch_cudagraph( num_tokens_padded, use_cascade_attn or has_encoder_output ) num_tokens_padded = batch_descriptor.num_tokens # Extra coordination when running data-parallel since we need to coordinate # across ranks should_ubatch, num_tokens_across_dp = False, None if self.vllm_config.parallel_config.data_parallel_size > 1: # Disable DP padding when running eager to avoid excessive padding when # running prefills. This lets us set cudagraph_mode="NONE" on the prefiller # in a P/D setup and still use CUDA graphs (enabled by this padding) on the # decoder. allow_dp_padding = ( self.compilation_config.cudagraph_mode != CUDAGraphMode.NONE ) should_ubatch, num_tokens_across_dp, synced_cudagraph_mode = ( coordinate_batch_across_dp( num_tokens_unpadded=num_tokens, parallel_config=self.parallel_config, allow_microbatching=allow_microbatching, allow_dp_padding=allow_dp_padding, num_tokens_padded=num_tokens_padded, uniform_decode=uniform_decode, num_scheduled_tokens_per_request=num_scheduled_tokens_np, cudagraph_mode=cudagraph_mode.value, ) ) # Extract DP-synced values if num_tokens_across_dp is not None: dp_rank = self.parallel_config.data_parallel_rank num_tokens_padded = int(num_tokens_across_dp[dp_rank].item()) # Re-dispatch with DP padding so we have the correct batch_descriptor cudagraph_mode, batch_descriptor = dispatch_cudagraph( num_tokens_padded, disable_full=synced_cudagraph_mode <= CUDAGraphMode.PIECEWISE.value, ) # Assert to make sure the agreed upon token count is correct otherwise # num_tokens_across_dp will no-longer be valid assert batch_descriptor.num_tokens == num_tokens_padded cudagraph_stats = None if self.vllm_config.observability_config.cudagraph_metrics: cudagraph_stats = CUDAGraphStat( num_unpadded_tokens=num_tokens, num_padded_tokens=batch_descriptor.num_tokens, num_paddings=batch_descriptor.num_tokens - num_tokens, runtime_mode=str(cudagraph_mode), ) return ( cudagraph_mode, batch_descriptor, should_ubatch, num_tokens_across_dp, cudagraph_stats, ) def _register_layerwise_nvtx_hooks(self) -> None: """ Register layerwise NVTX hooks if --enable-layerwise-nvtx-tracing is enabled to trace detailed information of each layer or module in the model. """ if ( self.vllm_config.observability_config.enable_layerwise_nvtx_tracing and not self.layerwise_nvtx_hooks_registered ): if self.compilation_config.cudagraph_mode != CUDAGraphMode.NONE: logger.debug_once( "layerwise NVTX tracing is not supported when CUDA graph is " "turned off; you may observe part or all of the model " "missing NVTX markers" ) # In STOCK_TORCH_COMPILE mode, after registering hooks here, # the __call__ function of nn.module will be recompiled with # fullgraph=True. Since nvtx.range_push/pop are not traceable # by torch dynamo, we can't register hook functions here # because hook functions will also be traced by torch dynamo. if ( self.vllm_config.compilation_config.mode == CompilationMode.STOCK_TORCH_COMPILE ): logger.debug_once( "layerwise NVTX tracing is not supported when " "CompilationMode is STOCK_TORCH_COMPILE, skipping " "function hooks registration" ) else: pyt_hooks = PytHooks() pyt_hooks.register_hooks(self.model, self.model.__class__.__name__) self.layerwise_nvtx_hooks_registered = True @torch.inference_mode() def execute_model( self, scheduler_output: "SchedulerOutput", intermediate_tensors: IntermediateTensors | None = None, ) -> ModelRunnerOutput | IntermediateTensors | None: if self.execute_model_state is not None: raise RuntimeError( "State error: sample_tokens() must be called " "after execute_model() returns None." ) # self._draft_token_ids is None when `input_fits_in_drafter=False` # and there is no draft tokens scheduled. so it need to update the # spec_decoding info in scheduler_output with async_scheduling. # use deepcopy to avoid the modification has influence on the # scheduler_output in engine core process. # TODO(Ronald1995): deepcopy is expensive when there is a large # number of requests, optimize it later. if ( self.use_async_scheduling and self.num_spec_tokens and self._draft_token_ids is None ): scheduler_output = deepcopy(scheduler_output) num_scheduled_tokens = scheduler_output.total_num_scheduled_tokens with record_function_or_nullcontext("gpu_model_runner: preprocess"): with self.synchronize_input_prep(): # Update persistent batch states. self._update_states(scheduler_output) if has_ec_transfer() and get_ec_transfer().is_producer: with self.maybe_get_ec_connector_output( scheduler_output, encoder_cache=self.encoder_cache, ) as ec_connector_output: self._execute_mm_encoder(scheduler_output) return make_empty_encoder_model_runner_output(scheduler_output) if not num_scheduled_tokens: if ( self.parallel_config.distributed_executor_backend == "external_launcher" and self.parallel_config.data_parallel_size > 1 ): # this is a corner case when both external launcher # and DP are enabled, num_scheduled_tokens could be # 0, and has_unfinished_requests in the outer loop # returns True. before returning early here we call # dummy run to ensure coordinate_batch_across_dp # is called into to avoid out of sync issues. self._dummy_run(1) if not has_kv_transfer_group(): # Return empty ModelRunnerOutput if no work to do. return EMPTY_MODEL_RUNNER_OUTPUT return self.kv_connector_no_forward( scheduler_output, self.vllm_config ) if self.cache_config.kv_sharing_fast_prefill: assert not self.num_prompt_logprobs, ( "--kv-sharing-fast-prefill produces incorrect " "logprobs for prompt tokens, tokens, please disable " "it when the requests need prompt logprobs" ) num_reqs = self.input_batch.num_reqs req_ids = self.input_batch.req_ids tokens = [scheduler_output.num_scheduled_tokens[i] for i in req_ids] num_scheduled_tokens_np = np.array(tokens, dtype=np.int32) max_num_scheduled_tokens = int(num_scheduled_tokens_np.max()) num_tokens_unpadded = scheduler_output.total_num_scheduled_tokens ( logits_indices, spec_decode_metadata, ) = self._prepare_inputs( scheduler_output, num_scheduled_tokens_np, ) cascade_attn_prefix_lens = None # Disable cascade attention when using microbatching (DBO) if self.cascade_attn_enabled and not self.parallel_config.enable_dbo: # Pre-compute cascade attention prefix lengths cascade_attn_prefix_lens = self._compute_cascade_attn_prefix_lens( num_scheduled_tokens_np, self.input_batch.num_computed_tokens_cpu[:num_reqs], scheduler_output.num_common_prefix_blocks, ) ( cudagraph_mode, batch_desc, should_ubatch, num_tokens_across_dp, cudagraph_stats, ) = self._determine_batch_execution_and_padding( num_tokens=num_tokens_unpadded, num_reqs=num_reqs, num_scheduled_tokens_np=num_scheduled_tokens_np, max_num_scheduled_tokens=max_num_scheduled_tokens, use_cascade_attn=cascade_attn_prefix_lens is not None, num_encoder_reqs=len(scheduler_output.scheduled_encoder_inputs), ) logger.debug( "Running batch with cudagraph_mode: %s, batch_descriptor: %s, " "should_ubatch: %s, num_tokens_across_dp: %s", cudagraph_mode, batch_desc, should_ubatch, num_tokens_across_dp, ) num_tokens_padded = batch_desc.num_tokens num_reqs_padded = ( batch_desc.num_reqs if batch_desc.num_reqs is not None else num_reqs ) ubatch_slices, ubatch_slices_padded = maybe_create_ubatch_slices( should_ubatch, num_scheduled_tokens_np, num_tokens_padded, num_reqs_padded, ) pad_attn = cudagraph_mode == CUDAGraphMode.FULL use_spec_decode = len(scheduler_output.scheduled_spec_decode_tokens) > 0 ubatch_slices_attn = ubatch_slices_padded if pad_attn else ubatch_slices (attn_metadata, spec_decode_common_attn_metadata) = ( self._build_attention_metadata( num_tokens=num_tokens_unpadded, num_tokens_padded=num_tokens_padded if pad_attn else None, num_reqs=num_reqs, num_reqs_padded=num_reqs_padded if pad_attn else None, max_query_len=max_num_scheduled_tokens, ubatch_slices=ubatch_slices_attn, logits_indices=logits_indices, use_spec_decode=use_spec_decode, num_scheduled_tokens=scheduler_output.num_scheduled_tokens, cascade_attn_prefix_lens=cascade_attn_prefix_lens, ) ) ( input_ids, inputs_embeds, positions, intermediate_tensors, model_kwargs, ec_connector_output, ) = self._preprocess( scheduler_output, num_tokens_padded, intermediate_tensors ) # Set cudagraph mode to none if calc_kv_scales is true. # KV scales calculation involves dynamic operations that are incompatible # with CUDA graph capture. if self.calculate_kv_scales: cudagraph_mode = CUDAGraphMode.NONE # Mark KV scales as calculated after the first forward pass self.calculate_kv_scales = False # Run the model. # Use persistent buffers for CUDA graphs. with ( set_forward_context( attn_metadata, self.vllm_config, num_tokens=num_tokens_padded, num_tokens_across_dp=num_tokens_across_dp, cudagraph_runtime_mode=cudagraph_mode, batch_descriptor=batch_desc, ubatch_slices=ubatch_slices_padded, ), record_function_or_nullcontext("gpu_model_runner: forward"), self.maybe_get_kv_connector_output(scheduler_output) as kv_connector_output, ): model_output = self._model_forward( input_ids=input_ids, positions=positions, intermediate_tensors=intermediate_tensors, inputs_embeds=inputs_embeds, **model_kwargs, ) with record_function_or_nullcontext("gpu_model_runner: postprocess"): if self.use_aux_hidden_state_outputs: # True when EAGLE 3 is used. hidden_states, aux_hidden_states = model_output else: # Common case. hidden_states = model_output aux_hidden_states = None if not self.broadcast_pp_output: # Common case. if not get_pp_group().is_last_rank: # Return the intermediate tensors. assert isinstance(hidden_states, IntermediateTensors) hidden_states.kv_connector_output = kv_connector_output self.kv_connector_output = kv_connector_output return hidden_states if self.is_pooling_model: # Return the pooling output. output = self._pool( hidden_states, num_scheduled_tokens, num_scheduled_tokens_np ) output.kv_connector_output = kv_connector_output return output sample_hidden_states = hidden_states[logits_indices] logits = self.model.compute_logits(sample_hidden_states) else: # Rare case. assert not self.is_pooling_model sample_hidden_states = hidden_states[logits_indices] if not get_pp_group().is_last_rank: all_gather_tensors = { "residual": not is_residual_scattered_for_sp( self.vllm_config, num_tokens_padded ) } get_pp_group().send_tensor_dict( hidden_states.tensors, all_gather_group=get_tp_group(), all_gather_tensors=all_gather_tensors, ) logits = None else: logits = self.model.compute_logits(sample_hidden_states) model_output_broadcast_data: dict[str, Any] = {} if logits is not None: model_output_broadcast_data["logits"] = logits.contiguous() broadcasted = get_pp_group().broadcast_tensor_dict( model_output_broadcast_data, src=len(get_pp_group().ranks) - 1 ) assert broadcasted is not None logits = broadcasted["logits"] self.execute_model_state = ExecuteModelState( scheduler_output, logits, spec_decode_metadata, spec_decode_common_attn_metadata, hidden_states, sample_hidden_states, aux_hidden_states, ec_connector_output, cudagraph_stats, ) self.kv_connector_output = kv_connector_output return None @torch.inference_mode def sample_tokens( self, grammar_output: "GrammarOutput | None" ) -> ModelRunnerOutput | AsyncModelRunnerOutput | IntermediateTensors: kv_connector_output = self.kv_connector_output self.kv_connector_output = None if self.execute_model_state is None: # Nothing to do (PP non-final rank case), output isn't used. if not kv_connector_output: return None # type: ignore[return-value] # In case of PP with kv transfer, we need to pass through the # kv_connector_output if kv_connector_output.is_empty(): return EMPTY_MODEL_RUNNER_OUTPUT output = copy(EMPTY_MODEL_RUNNER_OUTPUT) output.kv_connector_output = kv_connector_output return output # Unpack ephemeral state. ( scheduler_output, logits, spec_decode_metadata, spec_decode_common_attn_metadata, hidden_states, sample_hidden_states, aux_hidden_states, ec_connector_output, cudagraph_stats, ) = self.execute_model_state # Clear ephemeral state. self.execute_model_state = None # Apply structured output bitmasks if present. if grammar_output is not None: apply_grammar_bitmask( scheduler_output, grammar_output, self.input_batch, logits ) with record_function_or_nullcontext("gpu_model_runner: sample"): sampler_output = self._sample(logits, spec_decode_metadata) self.input_batch.prev_sampled_token_ids = None def propose_draft_token_ids(sampled_token_ids): assert spec_decode_common_attn_metadata is not None with record_function_or_nullcontext("gpu_model_runner: draft"): self._draft_token_ids = self.propose_draft_token_ids( scheduler_output, sampled_token_ids, self.input_batch.sampling_metadata, hidden_states, sample_hidden_states, aux_hidden_states, spec_decode_metadata, spec_decode_common_attn_metadata, ) spec_config = self.speculative_config use_padded_batch_for_eagle = ( spec_config is not None and spec_config.use_eagle() and not spec_config.disable_padded_drafter_batch ) effective_drafter_max_model_len = self.max_model_len if effective_drafter_max_model_len is None: effective_drafter_max_model_len = self.model_config.max_model_len if ( spec_config is not None and spec_config.draft_model_config is not None and spec_config.draft_model_config.max_model_len is not None ): effective_drafter_max_model_len = ( spec_config.draft_model_config.max_model_len ) input_fits_in_drafter = spec_decode_common_attn_metadata and ( spec_decode_common_attn_metadata.max_seq_len + self.num_spec_tokens <= effective_drafter_max_model_len ) if use_padded_batch_for_eagle: assert self.speculative_config is not None assert isinstance(self.drafter, EagleProposer) sampled_token_ids = sampler_output.sampled_token_ids if input_fits_in_drafter: # EAGLE speculative decoding can use the GPU sampled tokens # as inputs, and does not need to wait for bookkeeping to finish. propose_draft_token_ids(sampled_token_ids) elif self.valid_sampled_token_count_event is not None: assert spec_decode_common_attn_metadata is not None next_token_ids, valid_sampled_tokens_count = ( self.drafter.prepare_next_token_ids_padded( spec_decode_common_attn_metadata, sampled_token_ids, self.requests, self.input_batch, self.discard_request_mask.gpu, ) ) self._copy_valid_sampled_token_count( next_token_ids, valid_sampled_tokens_count ) with record_function_or_nullcontext("gpu_model_runner: bookkeep"): ( num_nans_in_logits, logprobs_lists, valid_sampled_token_ids, prompt_logprobs_dict, req_ids_output_copy, req_id_to_index_output_copy, invalid_req_indices, ) = self._bookkeeping_sync( scheduler_output, sampler_output, logits, hidden_states, scheduler_output.total_num_scheduled_tokens, spec_decode_metadata, ) if ( self.speculative_config and not use_padded_batch_for_eagle and input_fits_in_drafter ): # ngram and other speculative decoding methods use the sampled # tokens on the CPU, so they are run after bookkeeping. propose_draft_token_ids(valid_sampled_token_ids) with record_function_or_nullcontext("gpu_model_runner: eplb"): self.eplb_step() with record_function_or_nullcontext("gpu_model_runner: ModelRunnerOutput"): output = ModelRunnerOutput( req_ids=req_ids_output_copy, req_id_to_index=req_id_to_index_output_copy, sampled_token_ids=valid_sampled_token_ids, logprobs=logprobs_lists, prompt_logprobs_dict=prompt_logprobs_dict, pooler_output=[], kv_connector_output=kv_connector_output, ec_connector_output=ec_connector_output if self.supports_mm_inputs else None, num_nans_in_logits=num_nans_in_logits, cudagraph_stats=cudagraph_stats, ) if not self.use_async_scheduling: return output with record_function_or_nullcontext( "gpu_model_runner: AsyncGPUModelRunnerOutput" ): async_output = AsyncGPUModelRunnerOutput( model_runner_output=output, sampled_token_ids=sampler_output.sampled_token_ids, logprobs_tensors=sampler_output.logprobs_tensors, invalid_req_indices=invalid_req_indices, async_output_copy_stream=self.async_output_copy_stream, vocab_size=self.input_batch.vocab_size, ) with record_function_or_nullcontext( "gpu_model_runner: set_async_sampled_token_ids" ): # Save ref of sampled_token_ids CPU tensor if the batch contains # any requests with sampling params that require output ids. self.input_batch.set_async_sampled_token_ids( async_output.sampled_token_ids_cpu, async_output.async_copy_ready_event, ) return async_output def take_draft_token_ids(self) -> DraftTokenIds | None: if self._draft_token_ids is None: return None req_ids = self.input_batch.req_ids if isinstance(self._draft_token_ids, torch.Tensor): draft_token_ids = self._draft_token_ids.tolist() else: draft_token_ids = self._draft_token_ids self._draft_token_ids = None return DraftTokenIds(req_ids, draft_token_ids) def _copy_valid_sampled_token_count( self, next_token_ids: torch.Tensor, valid_sampled_tokens_count: torch.Tensor ) -> None: if self.valid_sampled_token_count_event is None: return default_stream = torch.cuda.current_stream() # Initialize a new stream to overlap the copy operation with # prepare_input of draft model. with torch.cuda.stream(self.valid_sampled_token_count_copy_stream): self.valid_sampled_token_count_copy_stream.wait_stream(default_stream) # type: ignore counts = valid_sampled_tokens_count counts_cpu = self.valid_sampled_token_count_cpu counts_cpu[: counts.shape[0]].copy_(counts, non_blocking=True) self.valid_sampled_token_count_event.record() self.input_batch.prev_sampled_token_ids = next_token_ids.unsqueeze(1) def _get_valid_sampled_token_count(self) -> list[int]: # Wait until valid_sampled_tokens_count is copied to cpu, prev_sampled_token_ids = self.input_batch.prev_sampled_token_ids if ( self.valid_sampled_token_count_event is None or prev_sampled_token_ids is None ): return [] counts_cpu = self.valid_sampled_token_count_cpu self.valid_sampled_token_count_event.synchronize() return counts_cpu[: prev_sampled_token_ids.shape[0]].tolist() def propose_draft_token_ids( self, scheduler_output: "SchedulerOutput", sampled_token_ids: torch.Tensor | list[list[int]], sampling_metadata: SamplingMetadata, hidden_states: torch.Tensor, sample_hidden_states: torch.Tensor, aux_hidden_states: list[torch.Tensor] | None, spec_decode_metadata: SpecDecodeMetadata | None, common_attn_metadata: CommonAttentionMetadata, ) -> list[list[int]] | torch.Tensor: num_scheduled_tokens = scheduler_output.total_num_scheduled_tokens spec_config = self.speculative_config assert spec_config is not None if spec_config.method == "ngram": assert isinstance(sampled_token_ids, list) assert isinstance(self.drafter, NgramProposer) draft_token_ids = self.drafter.propose( sampled_token_ids, self.input_batch.req_ids, self.input_batch.num_tokens_no_spec, self.input_batch.token_ids_cpu, self.input_batch.spec_decode_unsupported_reqs, ) elif spec_config.method == "suffix": assert isinstance(sampled_token_ids, list) assert isinstance(self.drafter, SuffixDecodingProposer) draft_token_ids = self.drafter.propose(self.input_batch, sampled_token_ids) elif spec_config.method == "medusa": assert isinstance(sampled_token_ids, list) assert isinstance(self.drafter, MedusaProposer) if sample_hidden_states.shape[0] == len(sampled_token_ids): # The input to the target model does not include draft tokens. hidden_states = sample_hidden_states else: indices = [] offset = 0 assert spec_decode_metadata is not None, ( "No spec decode metadata for medusa" ) for num_draft, tokens in zip( spec_decode_metadata.num_draft_tokens, sampled_token_ids ): indices.append(offset + len(tokens) - 1) offset += num_draft + 1 indices = torch.tensor(indices, device=self.device) hidden_states = sample_hidden_states[indices] draft_token_ids = self.drafter.propose( target_hidden_states=hidden_states, sampling_metadata=sampling_metadata, ) elif spec_config.use_eagle(): assert isinstance(self.drafter, EagleProposer) if spec_config.disable_padded_drafter_batch: # When padded-batch is disabled, the sampled_token_ids should be # the cpu-side list[list[int]] of valid sampled tokens for each # request, with invalid requests having empty lists. assert isinstance(sampled_token_ids, list), ( "sampled_token_ids should be a python list when" "padded-batch is disabled." ) next_token_ids = self.drafter.prepare_next_token_ids_cpu( sampled_token_ids, self.requests, self.input_batch, scheduler_output.num_scheduled_tokens, ) else: # When using padded-batch, the sampled_token_ids should be # the gpu tensor of sampled tokens for each request, of shape # (num_reqs, num_spec_tokens + 1) with rejected tokens having # value -1. assert isinstance(sampled_token_ids, torch.Tensor), ( "sampled_token_ids should be a torch.Tensor when" "padded-batch is enabled." ) next_token_ids, valid_sampled_tokens_count = ( self.drafter.prepare_next_token_ids_padded( common_attn_metadata, sampled_token_ids, self.requests, self.input_batch, self.discard_request_mask.gpu, ) ) self._copy_valid_sampled_token_count( next_token_ids, valid_sampled_tokens_count ) if spec_decode_metadata is None: token_indices_to_sample = None # input_ids can be None for multimodal models. target_token_ids = self.input_ids.gpu[:num_scheduled_tokens] target_positions = self._get_positions(num_scheduled_tokens) if self.use_aux_hidden_state_outputs: assert aux_hidden_states is not None target_hidden_states = torch.cat( [h[:num_scheduled_tokens] for h in aux_hidden_states], dim=-1 ) else: target_hidden_states = hidden_states[:num_scheduled_tokens] else: if spec_config.disable_padded_drafter_batch: token_indices_to_sample = None common_attn_metadata, token_indices = self.drafter.prepare_inputs( common_attn_metadata, sampled_token_ids, spec_decode_metadata.num_draft_tokens, ) target_token_ids = self.input_ids.gpu[token_indices] target_positions = self._get_positions(token_indices) if self.use_aux_hidden_state_outputs: assert aux_hidden_states is not None target_hidden_states = torch.cat( [h[token_indices] for h in aux_hidden_states], dim=-1 ) else: target_hidden_states = hidden_states[token_indices] else: common_attn_metadata, token_indices_to_sample = ( self.drafter.prepare_inputs_padded( common_attn_metadata, spec_decode_metadata, valid_sampled_tokens_count, ) ) total_num_tokens = common_attn_metadata.num_actual_tokens # When padding the batch, token_indices is just a range target_token_ids = self.input_ids.gpu[:total_num_tokens] target_positions = self._get_positions(total_num_tokens) if self.use_aux_hidden_state_outputs: assert aux_hidden_states is not None target_hidden_states = torch.cat( [h[:total_num_tokens] for h in aux_hidden_states], dim=-1 ) else: target_hidden_states = hidden_states[:total_num_tokens] if self.supports_mm_inputs: mm_embed_inputs = self._gather_mm_embeddings( scheduler_output, shift_computed_tokens=1, ) else: mm_embed_inputs = None draft_token_ids = self.drafter.propose( target_token_ids=target_token_ids, target_positions=target_positions, target_hidden_states=target_hidden_states, next_token_ids=next_token_ids, last_token_indices=token_indices_to_sample, sampling_metadata=sampling_metadata, common_attn_metadata=common_attn_metadata, mm_embed_inputs=mm_embed_inputs, ) return draft_token_ids def update_config(self, overrides: dict[str, Any]) -> None: allowed_config_names = {"load_config", "model_config"} for config_name, config_overrides in overrides.items(): assert config_name in allowed_config_names, ( f"Config `{config_name}` not supported. " f"Allowed configs: {allowed_config_names}" ) config = getattr(self, config_name) new_config = update_config(config, config_overrides) setattr(self, config_name, new_config) def load_model(self, eep_scale_up: bool = False) -> None: """ Args: eep_scale_up: the model loading is for elastic EP scale up. """ logger.info_once( "Starting to load model %s...", self.model_config.model, scope="global", ) global_expert_loads, old_global_expert_indices_per_model, rank_mapping = ( EplbState.get_eep_state(self.parallel_config) if eep_scale_up else (None, None, None) ) if self.parallel_config.enable_eplb: self.eplb_state = EplbState(self.parallel_config, self.device) eplb_models = 0 try: with DeviceMemoryProfiler() as m: time_before_load = time.perf_counter() model_loader = get_model_loader(self.load_config) self.model = model_loader.load_model( vllm_config=self.vllm_config, model_config=self.model_config ) if self.lora_config: self.model = self.load_lora_model( self.model, self.vllm_config, self.device ) if hasattr(self, "drafter"): logger.info_once("Loading drafter model...") self.drafter.load_model(self.model) if ( hasattr(self.drafter, "model") and is_mixture_of_experts(self.drafter.model) and self.parallel_config.enable_eplb ): spec_config = self.vllm_config.speculative_config assert spec_config is not None assert spec_config.draft_model_config is not None logger.info_once( "EPLB is enabled for drafter model %s.", spec_config.draft_model_config.model, ) global_expert_load = ( global_expert_loads[eplb_models] if global_expert_loads else None ) old_global_expert_indices = ( old_global_expert_indices_per_model[eplb_models] if old_global_expert_indices_per_model else None ) if self.eplb_state is None: self.eplb_state = EplbState( self.parallel_config, self.device ) self.eplb_state.add_model( self.drafter.model, spec_config.draft_model_config, global_expert_load, old_global_expert_indices, rank_mapping, ) eplb_models += 1 if self.use_aux_hidden_state_outputs: if not supports_eagle3(self.get_model()): raise RuntimeError( "Model does not support EAGLE3 interface but " "aux_hidden_state_outputs was requested" ) # Try to get auxiliary layers from speculative config, # otherwise use model's default layers aux_layers = self._get_eagle3_aux_layers_from_config() if aux_layers: logger.info( "Using auxiliary layers from speculative config: %s", aux_layers, ) else: aux_layers = self.model.get_eagle3_aux_hidden_state_layers() self.model.set_aux_hidden_state_layers(aux_layers) time_after_load = time.perf_counter() self.model_memory_usage = m.consumed_memory except torch.cuda.OutOfMemoryError as e: msg = ( "Failed to load model - not enough GPU memory. " "Try lowering --gpu-memory-utilization to free memory for weights, " "increasing --tensor-parallel-size, or using --quantization. " "See https://docs.vllm.ai/en/latest/configuration/conserving_memory/ " "for more tips." ) combined_msg = f"{msg} (original error: {e})" logger.error(combined_msg) raise e logger.info_once( "Model loading took %.4f GiB memory and %.6f seconds", self.model_memory_usage / GiB_bytes, time_after_load - time_before_load, scope="local", ) prepare_communication_buffer_for_model(self.model) if (drafter := getattr(self, "drafter", None)) and ( drafter_model := getattr(drafter, "model", None) ): prepare_communication_buffer_for_model(drafter_model) mm_config = self.model_config.multimodal_config self.is_multimodal_pruning_enabled = ( supports_multimodal_pruning(self.get_model()) and mm_config is not None and mm_config.is_multimodal_pruning_enabled() ) if is_mixture_of_experts(self.model) and self.parallel_config.enable_eplb: logger.info_once("EPLB is enabled for model %s.", self.model_config.model) global_expert_load = ( global_expert_loads[eplb_models] if global_expert_loads else None ) old_global_expert_indices = ( old_global_expert_indices_per_model[eplb_models] if old_global_expert_indices_per_model else None ) assert self.eplb_state is not None self.eplb_state.add_model( self.model, self.model_config, global_expert_load, old_global_expert_indices, rank_mapping, ) if self.eplb_state.is_async: self.eplb_state.start_async_loop(rank_mapping=rank_mapping) if ( self.vllm_config.compilation_config.mode == CompilationMode.STOCK_TORCH_COMPILE and supports_dynamo() ): backend = self.vllm_config.compilation_config.init_backend(self.vllm_config) compilation_counter.stock_torch_compile_count += 1 self.model.compile(fullgraph=True, backend=backend) return # for other compilation modes, cudagraph behavior is controlled by # CudagraphWraper and CudagraphDispatcher of vllm. # wrap the model with full cudagraph wrapper if needed. cudagraph_mode = self.compilation_config.cudagraph_mode assert cudagraph_mode is not None if cudagraph_mode.has_full_cudagraphs() and not self.parallel_config.enable_dbo: self.model = CUDAGraphWrapper( self.model, self.vllm_config, runtime_mode=CUDAGraphMode.FULL ) elif self.parallel_config.enable_dbo: if cudagraph_mode.has_full_cudagraphs(): self.model = UBatchWrapper( self.model, self.vllm_config, CUDAGraphMode.FULL, self.device ) else: self.model = UBatchWrapper( self.model, self.vllm_config, CUDAGraphMode.NONE, self.device ) def _get_eagle3_aux_layers_from_config(self) -> tuple[int, ...] | None: """Extract Eagle3 auxiliary layer indices from speculative config. These indices specify which hidden states from the base model should be used as auxiliary inputs for the Eagle3 drafter model during speculative decoding. Returns: Tuple of layer indices if found in draft model config, None otherwise. """ if not (self.speculative_config and self.speculative_config.draft_model_config): return None hf_config = self.speculative_config.draft_model_config.hf_config if not hasattr(hf_config, "eagle_aux_hidden_state_layer_ids"): return None layer_ids = hf_config.eagle_aux_hidden_state_layer_ids if layer_ids and isinstance(layer_ids, (list, tuple)): return tuple(layer_ids) return None def reload_weights(self) -> None: assert getattr(self, "model", None) is not None, ( "Cannot reload weights before model is loaded." ) model_loader = get_model_loader(self.load_config) logger.info("Reloading weights inplace...") model_loader.load_weights(self.get_model(), model_config=self.model_config) def save_tensorized_model( self, tensorizer_config: "TensorizerConfig", ) -> None: TensorizerLoader.save_model( self.get_model(), tensorizer_config=tensorizer_config, model_config=self.model_config, ) def _get_prompt_logprobs_dict( self, hidden_states: torch.Tensor, num_scheduled_tokens: dict[str, int], ) -> dict[str, LogprobsTensors | None]: num_prompt_logprobs_dict = self.num_prompt_logprobs if not num_prompt_logprobs_dict: return {} in_progress_dict = self.input_batch.in_progress_prompt_logprobs_cpu prompt_logprobs_dict: dict[str, LogprobsTensors | None] = {} # Since prompt logprobs are a rare feature, prioritize simple, # maintainable loop over optimal performance. completed_prefill_reqs = [] for req_id, num_prompt_logprobs in num_prompt_logprobs_dict.items(): num_tokens = num_scheduled_tokens.get(req_id) if num_tokens is None: # This can happen if the request was preempted in prefill stage. continue # Get metadata for this request. request = self.requests[req_id] if request.prompt_token_ids is None: # Prompt logprobs is incompatible with prompt embeddings continue num_prompt_tokens = len(request.prompt_token_ids) prompt_token_ids = torch.tensor(request.prompt_token_ids).to( self.device, non_blocking=True ) # Set up target LogprobsTensors object. logprobs_tensors = in_progress_dict.get(req_id) if not logprobs_tensors: # Create empty logprobs CPU tensors for the entire prompt. # If chunked, we'll copy in slice by slice. logprobs_tensors = LogprobsTensors.empty_cpu( num_prompt_tokens - 1, num_prompt_logprobs + 1 ) in_progress_dict[req_id] = logprobs_tensors # Determine number of logits to retrieve. start_idx = request.num_computed_tokens start_tok = start_idx + 1 num_remaining_tokens = num_prompt_tokens - start_tok if num_tokens <= num_remaining_tokens: # This is a chunk, more tokens remain. # In the == case, there are no more prompt logprobs to produce # but we want to defer returning them to the next step where we # have new generated tokens to return. num_logits = num_tokens else: # This is the last chunk of prompt tokens to return. num_logits = num_remaining_tokens completed_prefill_reqs.append(req_id) prompt_logprobs_dict[req_id] = logprobs_tensors if num_logits <= 0: # This can happen for the final chunk if we prefilled exactly # (num_prompt_tokens - 1) tokens for this request in the prior # step. There are no more prompt logprobs to produce. continue # Get the logits corresponding to this req's prompt tokens. # If this is a partial request (i.e. chunked prefill), # then there is prompt logprob generated for each index. req_idx = self.input_batch.req_id_to_index[req_id] offset = self.query_start_loc.np[req_idx].item() prompt_hidden_states = hidden_states[offset : offset + num_logits] logits = self.model.compute_logits(prompt_hidden_states) # Get the "target" tokens for each index. For prompt at index i, # the token at prompt index i+1 is the "sampled" token we want # to gather the logprob for. tgt_token_ids = prompt_token_ids[start_tok : start_tok + num_logits] # Compute prompt logprobs. logprobs = self.sampler.compute_logprobs(logits) token_ids, logprobs, ranks = self.sampler.gather_logprobs( logprobs, num_prompt_logprobs, tgt_token_ids ) # Transfer GPU->CPU async. chunk_slice = slice(start_idx, start_idx + num_logits) logprobs_tensors.logprob_token_ids[chunk_slice].copy_( token_ids, non_blocking=True ) logprobs_tensors.logprobs[chunk_slice].copy_(logprobs, non_blocking=True) logprobs_tensors.selected_token_ranks[chunk_slice].copy_( ranks, non_blocking=True ) # Remove requests that have completed prefill from the batch # num_prompt_logprobs_dict. for req_id in completed_prefill_reqs: del num_prompt_logprobs_dict[req_id] del in_progress_dict[req_id] # Must synchronize the non-blocking GPU->CPU transfers. if prompt_logprobs_dict: self._sync_device() return prompt_logprobs_dict def _get_nans_in_logits( self, logits: torch.Tensor | None, ) -> dict[str, int]: try: if logits is None: return {req_id: 0 for req_id in self.input_batch.req_ids} num_nans_in_logits = {} num_nans_for_index = logits.isnan().sum(dim=-1).cpu().numpy() for req_id in self.input_batch.req_ids: req_index = self.input_batch.req_id_to_index[req_id] num_nans_in_logits[req_id] = ( int(num_nans_for_index[req_index]) if num_nans_for_index is not None and req_index < logits.shape[0] else 0 ) return num_nans_in_logits except IndexError: return {} @contextmanager def maybe_randomize_inputs( self, input_ids: torch.Tensor | None, inputs_embeds: torch.Tensor | None ): """ Randomize input_ids if VLLM_RANDOMIZE_DP_DUMMY_INPUTS is set. This is to help balance expert-selection - during profile_run - during DP rank dummy run """ dp_size = self.vllm_config.parallel_config.data_parallel_size randomize_inputs = envs.VLLM_RANDOMIZE_DP_DUMMY_INPUTS and dp_size > 1 if not randomize_inputs: yield elif input_ids is not None: @functools.cache def rand_input_ids() -> torch.Tensor: return torch.randint_like( self.input_ids.gpu, low=0, high=self.model_config.get_vocab_size(), ) logger.debug_once("Randomizing dummy input_ids for DP Rank") input_ids.copy_(rand_input_ids()[: input_ids.size(0)], non_blocking=True) yield input_ids.fill_(0) else: @functools.cache def rand_inputs_embeds() -> torch.Tensor: return torch.randn_like( self.inputs_embeds.gpu, ) assert inputs_embeds is not None logger.debug_once("Randomizing dummy inputs_embeds for DP Rank") inputs_embeds.copy_( rand_inputs_embeds()[: inputs_embeds.size(0)], non_blocking=True ) yield inputs_embeds.fill_(0) def _get_mm_dummy_batch( self, modality: str, max_items_per_batch: int, ) -> BatchedTensorInputs: """Dummy data for profiling and precompiling multimodal models.""" assert self.mm_budget is not None dummy_decoder_data = self.mm_registry.get_decoder_dummy_data( model_config=self.model_config, seq_len=self.max_model_len, mm_counts={modality: 1}, cache=self.mm_budget.cache, ) dummy_mm_data = dummy_decoder_data.multi_modal_data # Result in the maximum GPU consumption of the model dummy_mm_item = dummy_mm_data[modality][0] dummy_mm_items = [dummy_mm_item] * max_items_per_batch return next( mm_kwargs_group for _, _, mm_kwargs_group in group_mm_kwargs_by_modality( dummy_mm_items, device=self.device, pin_memory=self.pin_memory, ) ) @torch.inference_mode() def _dummy_run( self, num_tokens: int, cudagraph_runtime_mode: CUDAGraphMode | None = None, force_attention: bool = False, uniform_decode: bool = False, allow_microbatching: bool = True, skip_eplb: bool = False, is_profile: bool = False, create_mixed_batch: bool = False, remove_lora: bool = True, activate_lora: bool = False, is_graph_capturing: bool = False, ) -> tuple[torch.Tensor, torch.Tensor]: """ Run a dummy forward pass to warm up/profile run or capture the CUDA graph for the model. Args: num_tokens: Number of tokens to run the dummy forward pass. cudagraph_runtime_mode: used to control the behavior. - if not set will determine the cudagraph mode based on using the self.cudagraph_dispatcher. - CUDAGraphMode.NONE: No cudagraph, for warm up and profile run - CUDAGraphMode.PIECEWISE: Piecewise cudagraph. - CUDAGraphMode.FULL: Full cudagraph, attention metadata is needed. force_attention: If True, always create attention metadata. Used to warm up attention backend when mode is NONE. uniform_decode: If True, the batch is a uniform decode batch. skip_eplb: If True, skip EPLB state update. is_profile: If True, this is a profile run. create_mixed_batch: If True, create a mixed batch with both decode (1 token) and prefill (multiple tokens) requests. remove_lora: If False, dummy LoRAs are not destroyed after the run activate_lora: If False, dummy_run is performed without LoRAs. """ assert ( cudagraph_runtime_mode is None or cudagraph_runtime_mode.valid_runtime_modes() ) # If cudagraph_mode.decode_mode() == FULL and # cudagraph_mode.separate_routine(). This means that we are using # different graphs and/or modes for mixed prefill-decode batches vs. # uniform decode batches. A uniform decode batch means that all # requests have identical query length, except a potential virtual # request (shorter) in the batch account for padding. # Uniform decode batch could either be common pure decode, where # max_query_len == 1, or speculative decode, where # max_query_len == 1 + num_spec_decode_tokens. # When setting max_query_len = 1, we switch to and capture the optimized # routine of FA2 for pure decode, i.e., Flashdecode + an optimization # for GQA/MQA. max_query_len = self.uniform_decode_query_len if uniform_decode else num_tokens # Set num_scheduled_tokens based on num_tokens and max_num_seqs # for dummy run with LoRA so that the num_reqs collectively # has num_tokens in total. assert num_tokens <= self.scheduler_config.max_num_batched_tokens max_num_reqs = self.scheduler_config.max_num_seqs if create_mixed_batch: assert not uniform_decode # Create mixed batch: # first half decode tokens, second half one prefill num_decode_tokens = min(max_num_reqs - 1, num_tokens // 2) num_prefill_tokens = num_tokens - num_decode_tokens num_reqs = num_decode_tokens + 1 # Create decode requests (1 token each) followed by prefill request num_scheduled_tokens_list = [1] * num_decode_tokens + [num_prefill_tokens] # Note: Overriding max_query_len to be the prefill tokens max_query_len = num_prefill_tokens elif uniform_decode: assert not create_mixed_batch num_reqs = min(max_num_reqs, cdiv(num_tokens, max_query_len)) num_scheduled_tokens_list = [max_query_len] * num_reqs if num_tokens % max_query_len != 0: num_scheduled_tokens_list[-1] = num_tokens % max_query_len else: num_reqs = min(num_tokens, max_num_reqs) min_tokens_per_req = num_tokens // num_reqs num_scheduled_tokens_list = [min_tokens_per_req] * num_reqs num_scheduled_tokens_list[-1] += num_tokens % num_reqs assert sum(num_scheduled_tokens_list) == num_tokens assert len(num_scheduled_tokens_list) == num_reqs num_scheduled_tokens = np.array(num_scheduled_tokens_list, dtype=np.int32) num_tokens_unpadded = int(num_scheduled_tokens.sum()) num_sampled_tokens = np.ones(num_reqs, dtype=np.int32) _cudagraph_mode, batch_desc, should_ubatch, num_tokens_across_dp, _ = ( self._determine_batch_execution_and_padding( num_tokens=num_tokens_unpadded, num_reqs=num_reqs, num_scheduled_tokens_np=num_scheduled_tokens, max_num_scheduled_tokens=max_query_len, use_cascade_attn=False, allow_microbatching=allow_microbatching, force_eager=is_profile or (cudagraph_runtime_mode == CUDAGraphMode.NONE), # `force_uniform_decode` is used for cudagraph capture; because for # capturing mixed prefill-decode batches, we sometimes use # num_tokens == num_reqs which looks like a uniform decode batch to the # dispatcher; but we actually want to capture a piecewise cudagraph force_uniform_decode=uniform_decode, # `force_has_lora` is used for cudagraph capture; because LoRA is # activated later in the context manager, but we need to know the # LoRA state when determining the batch descriptor for capture force_has_lora=activate_lora, ) ) if cudagraph_runtime_mode is None: cudagraph_runtime_mode = _cudagraph_mode else: assert cudagraph_runtime_mode == _cudagraph_mode, ( f"Cudagraph runtime mode mismatch in dummy_run. " f"Expected {_cudagraph_mode}, but got {cudagraph_runtime_mode}." ) num_tokens_padded = batch_desc.num_tokens num_reqs_padded = ( batch_desc.num_reqs if batch_desc.num_reqs is not None else num_reqs ) ubatch_slices, ubatch_slices_padded = maybe_create_ubatch_slices( should_ubatch, num_scheduled_tokens, num_tokens_padded, num_reqs_padded ) attn_metadata: PerLayerAttnMetadata | None = None # If force_attention is True, we always capture attention. Otherwise, # it only happens for cudagraph_runtime_mode=FULL. if force_attention or cudagraph_runtime_mode == CUDAGraphMode.FULL: if create_mixed_batch: # In the mixed batch mode (used for FI warmup), we use # shorter sequence lengths to run faster. # TODO(luka) better system for describing dummy batches seq_lens = [1] * num_decode_tokens + [num_prefill_tokens + 1] else: seq_lens = max_query_len # type: ignore[assignment] self.seq_lens.np[:num_reqs] = seq_lens self.seq_lens.np[num_reqs:] = 0 self.seq_lens.copy_to_gpu() cum_num_tokens, _ = self._get_cumsum_and_arange(num_scheduled_tokens) self.query_start_loc.np[1 : num_reqs + 1] = cum_num_tokens self.query_start_loc.copy_to_gpu() pad_attn = cudagraph_runtime_mode == CUDAGraphMode.FULL attn_metadata, _ = self._build_attention_metadata( num_tokens=num_tokens_unpadded, num_reqs=num_reqs_padded, max_query_len=max_query_len, ubatch_slices=ubatch_slices_padded if pad_attn else ubatch_slices, for_cudagraph_capture=is_graph_capturing, ) with self.maybe_dummy_run_with_lora( self.lora_config, num_scheduled_tokens, num_sampled_tokens, activate_lora, remove_lora, ): # Make sure padding doesn't exceed max_num_tokens assert num_tokens_padded <= self.max_num_tokens model_kwargs = self._init_model_kwargs(num_tokens_padded) if self.supports_mm_inputs and not self.model_config.is_encoder_decoder: input_ids = None inputs_embeds = self.inputs_embeds.gpu[:num_tokens_padded] model_kwargs = { **model_kwargs, **self._dummy_mm_kwargs(num_reqs), } elif self.enable_prompt_embeds: input_ids = None inputs_embeds = self.inputs_embeds.gpu[:num_tokens_padded] model_kwargs = self._init_model_kwargs(num_tokens_padded) else: input_ids = self.input_ids.gpu[:num_tokens_padded] inputs_embeds = None if self.uses_mrope: positions = self.mrope_positions.gpu[:, :num_tokens_padded] elif self.uses_xdrope_dim > 0: positions = self.xdrope_positions.gpu[:, :num_tokens_padded] else: positions = self.positions.gpu[:num_tokens_padded] if get_pp_group().is_first_rank: intermediate_tensors = None else: if self.intermediate_tensors is None: self.intermediate_tensors = ( self.model.make_empty_intermediate_tensors( batch_size=self.max_num_tokens, dtype=self.model_config.dtype, device=self.device, ) ) intermediate_tensors = self.sync_and_slice_intermediate_tensors( num_tokens_padded, None, False ) if ubatch_slices_padded is not None: # Adjust values to reflect a single ubatch. # TODO(sage,lucas): this is cruft that should be addressed in # the padding refactor. num_tokens_padded = ubatch_slices_padded[0].num_tokens if num_tokens_across_dp is not None: num_tokens_across_dp[:] = num_tokens_padded with ( self.maybe_randomize_inputs(input_ids, inputs_embeds), set_forward_context( attn_metadata, self.vllm_config, num_tokens=num_tokens_padded, num_tokens_across_dp=num_tokens_across_dp, cudagraph_runtime_mode=cudagraph_runtime_mode, batch_descriptor=batch_desc, ubatch_slices=ubatch_slices_padded, ), ): outputs = self.model( input_ids=input_ids, positions=positions, intermediate_tensors=intermediate_tensors, inputs_embeds=inputs_embeds, **model_kwargs, ) if self.use_aux_hidden_state_outputs: hidden_states, _ = outputs else: hidden_states = outputs if self.speculative_config and self.speculative_config.use_eagle(): assert isinstance(self.drafter, EagleProposer) # Eagle currently only supports PIECEWISE cudagraphs. # Therefore only use cudagraphs if the main model uses PIECEWISE # NOTE(lucas): this is a hack, need to clean up. use_cudagraphs = ( ( is_graph_capturing and cudagraph_runtime_mode == CUDAGraphMode.PIECEWISE ) or ( not is_graph_capturing and cudagraph_runtime_mode != CUDAGraphMode.NONE ) ) and not self.speculative_config.enforce_eager # Note(gnovack) - We need to disable cudagraphs for one of the two # lora cases when cudagraph_specialize_lora is enabled. This is a # short term mitigation for issue mentioned in # https://github.com/vllm-project/vllm/issues/28334 if self.compilation_config.cudagraph_specialize_lora and activate_lora: use_cudagraphs = False self.drafter.dummy_run( num_tokens, use_cudagraphs=use_cudagraphs, is_graph_capturing=is_graph_capturing, ) # We register layerwise NVTX hooks here after the first dynamo tracing is # done to avoid nvtx operations in hook functions being traced by # torch dynamo and causing graph breaks. # Note that for DYNAMO_ONCE and VLLM_COMPILE mode, # compiled model's dynamo tracing is only done once and the compiled model's # __call__ function is replaced by calling the compiled function. # So it's safe to register hooks here. Hooks will be registered to # both compiled and uncompiled models but they will never # be called on the compiled model execution path. self._register_layerwise_nvtx_hooks() # This is necessary to avoid blocking DP. # For dummy runs, we typically skip EPLB since we don't have any real # requests to process. # However, in DP settings, there may be cases when some DP ranks do # not have any requests to process, so they're executing dummy batches. # In such cases, we still have to trigger EPLB to make sure # ranks execute the rearrangement in synchronization. if not skip_eplb: self.eplb_step(is_dummy=True, is_profile=is_profile) logit_indices = np.cumsum(num_scheduled_tokens) - 1 logit_indices_device = torch.from_numpy(logit_indices).to( self.device, non_blocking=True ) return hidden_states, hidden_states[logit_indices_device] @torch.inference_mode() def _dummy_sampler_run( self, hidden_states: torch.Tensor, ) -> torch.Tensor: # The dummy hidden states may contain special values, # like `inf` or `nan`. # To avoid breaking the sampler, we use a random tensor here instead. hidden_states = torch.rand_like(hidden_states) logits = self.model.compute_logits(hidden_states) num_reqs = logits.size(0) dummy_tensors = lambda v: torch.full((num_reqs,), v, device=self.device) dummy_metadata = SamplingMetadata( temperature=dummy_tensors(0.5), all_greedy=False, all_random=False, top_p=dummy_tensors(0.9), top_k=dummy_tensors(logits.size(1) - 1), generators={}, max_num_logprobs=None, no_penalties=True, prompt_token_ids=None, frequency_penalties=dummy_tensors(0.1), presence_penalties=dummy_tensors(0.1), repetition_penalties=dummy_tensors(0.1), output_token_ids=[[] for _ in range(num_reqs)], spec_token_ids=[[] for _ in range(num_reqs)], allowed_token_ids_mask=None, bad_words_token_ids={}, logitsprocs=LogitsProcessors(), ) try: sampler_output = self.sampler( logits=logits, sampling_metadata=dummy_metadata ) except RuntimeError as e: if "out of memory" in str(e): raise RuntimeError( "CUDA out of memory occurred when warming up sampler with " f"{num_reqs} dummy requests. Please try lowering " "`max_num_seqs` or `gpu_memory_utilization` when " "initializing the engine." ) from e else: raise e if self.speculative_config: draft_token_ids = [[0] for _ in range(num_reqs)] dummy_spec_decode_metadata = SpecDecodeMetadata.make_dummy( draft_token_ids, self.device ) num_tokens = sum(len(ids) for ids in draft_token_ids) # draft_probs = torch.randn( # num_tokens, logits.shape[-1], device=self.device, # dtype=logits.dtype) draft_probs = None logits = torch.randn( num_tokens + num_reqs, logits.shape[-1], device=self.device, dtype=logits.dtype, ) self.rejection_sampler( dummy_spec_decode_metadata, draft_probs, logits, dummy_metadata, ) return sampler_output def _dummy_pooler_run_task( self, hidden_states: torch.Tensor, task: PoolingTask, ) -> PoolerOutput: num_tokens = hidden_states.shape[0] max_num_reqs = self.scheduler_config.max_num_seqs num_reqs = min(num_tokens, max_num_reqs) min_tokens_per_req = num_tokens // num_reqs num_scheduled_tokens_list = [min_tokens_per_req] * num_reqs num_scheduled_tokens_list[-1] += num_tokens % num_reqs assert sum(num_scheduled_tokens_list) == num_tokens assert len(num_scheduled_tokens_list) == num_reqs req_num_tokens = num_tokens // num_reqs dummy_prompt_lens = torch.tensor( num_scheduled_tokens_list, device="cpu", ) dummy_token_ids = torch.zeros( (num_reqs, req_num_tokens), dtype=torch.int32, device=self.device ) model = cast(VllmModelForPooling, self.get_model()) dummy_pooling_params = PoolingParams(task=task) dummy_pooling_params.verify(task=task, model_config=self.model_config) to_update = model.pooler.get_pooling_updates(task) to_update.apply(dummy_pooling_params) dummy_metadata = PoolingMetadata( prompt_lens=dummy_prompt_lens, prompt_token_ids=dummy_token_ids, pooling_params=[dummy_pooling_params] * num_reqs, pooling_states=[PoolingStates() for i in range(num_reqs)], ) dummy_metadata.build_pooling_cursor( num_scheduled_tokens_list, seq_lens_cpu=dummy_prompt_lens, device=hidden_states.device, ) try: return model.pooler( hidden_states=hidden_states, pooling_metadata=dummy_metadata ) except RuntimeError as e: if "out of memory" in str(e): raise RuntimeError( "CUDA out of memory occurred when warming up pooler " f"({task=}) with {num_reqs} dummy requests. Please try " "lowering `max_num_seqs` or `gpu_memory_utilization` when " "initializing the engine." ) from e else: raise e @torch.inference_mode() def _dummy_pooler_run( self, hidden_states: torch.Tensor, ) -> PoolerOutput: # Find the task that has the largest output for subsequent steps supported_pooling_tasks = self.get_supported_pooling_tasks() if not supported_pooling_tasks: raise RuntimeError( f"Model {self.model_config.model} does not support " "any pooling tasks. See " "https://docs.vllm.ai/en/latest/models/pooling_models.html " "to learn more." ) output_size = dict[PoolingTask, float]() for task in supported_pooling_tasks: # Run a full batch with each task to ensure none of them OOMs output = self._dummy_pooler_run_task(hidden_states, task) output_size[task] = sum(o.nbytes for o in output) del output # Allow GC max_task = max(output_size.items(), key=lambda x: x[1])[0] return self._dummy_pooler_run_task(hidden_states, max_task) def profile_run(self) -> None: # Profile with multimodal encoder & encoder cache. if self.supports_mm_inputs: mm_config = self.model_config.multimodal_config if mm_config is not None and mm_config.skip_mm_profiling: logger.info( "Skipping memory profiling for multimodal encoder and " "encoder cache." ) else: mm_budget = self.mm_budget assert mm_budget is not None if (encoder_budget := mm_budget.get_encoder_budget()) > 0: # NOTE: Currently model is profiled with a single non-text # modality with the max possible input tokens even when # it supports multiple. dummy_modality = mm_budget.get_modality_with_max_tokens() max_mm_items_per_batch = mm_budget.max_items_per_batch_by_modality[ dummy_modality ] logger.info( "Encoder cache will be initialized with a budget of " "%s tokens, and profiled with %s %s items of the " "maximum feature size.", encoder_budget, max_mm_items_per_batch, dummy_modality, ) # Create dummy batch of multimodal inputs. batched_dummy_mm_inputs = self._get_mm_dummy_batch( dummy_modality, max_mm_items_per_batch, ) # Run multimodal encoder. dummy_encoder_outputs = self.model.embed_multimodal( **batched_dummy_mm_inputs ) sanity_check_mm_encoder_outputs( dummy_encoder_outputs, expected_num_items=max_mm_items_per_batch, ) for i, output in enumerate(dummy_encoder_outputs): self.encoder_cache[f"tmp_{i}"] = output # Add `is_profile` here to pre-allocate communication buffers hidden_states, last_hidden_states = self._dummy_run( self.max_num_tokens, is_profile=True ) if get_pp_group().is_last_rank: if self.is_pooling_model: output = self._dummy_pooler_run(hidden_states) else: output = self._dummy_sampler_run(last_hidden_states) else: output = None self._sync_device() del hidden_states, output self.encoder_cache.clear() gc.collect() def capture_model(self) -> int: if self.compilation_config.cudagraph_mode == CUDAGraphMode.NONE: logger.warning( "Skipping CUDA graph capture. To turn on CUDA graph capture, " "ensure `cudagraph_mode` was not manually set to `NONE`" ) return 0 compilation_counter.num_gpu_runner_capture_triggers += 1 start_time = time.perf_counter() @contextmanager def freeze_gc(): # Optimize garbage collection during CUDA graph capture. # Clean up, then freeze all remaining objects from being included # in future collections. gc.collect() should_freeze = not envs.VLLM_ENABLE_CUDAGRAPH_GC if should_freeze: gc.freeze() try: yield finally: if should_freeze: gc.unfreeze() gc.collect() # Trigger CUDA graph capture for specific shapes. # Capture the large shapes first so that the smaller shapes # can reuse the memory pool allocated for the large shapes. set_cudagraph_capturing_enabled(True) with freeze_gc(), graph_capture(device=self.device): start_free_gpu_memory = torch.cuda.mem_get_info()[0] cudagraph_mode = self.compilation_config.cudagraph_mode assert cudagraph_mode is not None if self.lora_config: if self.compilation_config.cudagraph_specialize_lora: lora_cases = [True, False] else: lora_cases = [True] else: lora_cases = [False] if cudagraph_mode.mixed_mode() != CUDAGraphMode.NONE: cudagraph_runtime_mode = cudagraph_mode.mixed_mode() # make sure we capture the largest batch size first compilation_cases = list( product(reversed(self.cudagraph_batch_sizes), lora_cases) ) self._capture_cudagraphs( compilation_cases, cudagraph_runtime_mode=cudagraph_runtime_mode, uniform_decode=False, ) # Capture full cudagraph for uniform decode batches if we # don't already have full mixed prefill-decode cudagraphs. if ( cudagraph_mode.decode_mode() == CUDAGraphMode.FULL and cudagraph_mode.separate_routine() ): max_num_tokens = ( self.scheduler_config.max_num_seqs * self.uniform_decode_query_len ) decode_cudagraph_batch_sizes = [ x for x in self.cudagraph_batch_sizes if max_num_tokens >= x >= self.uniform_decode_query_len ] compilation_cases_decode = list( product(reversed(decode_cudagraph_batch_sizes), lora_cases) ) self._capture_cudagraphs( compilation_cases=compilation_cases_decode, cudagraph_runtime_mode=CUDAGraphMode.FULL, uniform_decode=True, ) torch.cuda.synchronize() end_free_gpu_memory = torch.cuda.mem_get_info()[0] # Disable cudagraph capturing globally, so any unexpected cudagraph # capturing will be detected and raise an error after here. # Note: We don't put it into graph_capture context manager because # we may do lazy capturing in future that still allows capturing # after here. set_cudagraph_capturing_enabled(False) # Lock workspace to prevent resizing during execution. # Max workspace sizes should have been captured during warmup/profiling. lock_workspace() end_time = time.perf_counter() elapsed_time = end_time - start_time cuda_graph_size = start_free_gpu_memory - end_free_gpu_memory # This usually takes 5~20 seconds. logger.info_once( "Graph capturing finished in %.0f secs, took %.2f GiB", elapsed_time, cuda_graph_size / (1 << 30), scope="local", ) return cuda_graph_size def _capture_cudagraphs( self, compilation_cases: list[tuple[int, bool]], cudagraph_runtime_mode: CUDAGraphMode, uniform_decode: bool, ): assert ( cudagraph_runtime_mode != CUDAGraphMode.NONE and cudagraph_runtime_mode.valid_runtime_modes() ), f"Invalid cudagraph runtime mode: {cudagraph_runtime_mode}" # Only rank 0 should print progress bar during capture if is_global_first_rank(): compilation_cases = tqdm( compilation_cases, disable=not self.load_config.use_tqdm_on_load, desc="Capturing CUDA graphs ({}, {})".format( "decode" if uniform_decode else "mixed prefill-decode", cudagraph_runtime_mode.name, ), ) # We skip EPLB here since we don't want to record dummy metrics for num_tokens, activate_lora in compilation_cases: # We currently only capture ubatched graphs when its a FULL # cudagraph, a uniform decode batch, and the number of tokens # is above the threshold. Otherwise we just capture a non-ubatched # version of the graph allow_microbatching = ( self.parallel_config.enable_dbo and cudagraph_runtime_mode == CUDAGraphMode.FULL and uniform_decode and check_ubatch_thresholds( config=self.vllm_config.parallel_config, num_tokens=num_tokens, uniform_decode=uniform_decode, ) ) for _ in range(self.compilation_config.cudagraph_num_of_warmups): # Use CUDAGraphRuntimeStyle.NONE (default) for warmup. # But be careful, warm up with `NONE`is orthogonal to # if we want to warm up attention or not. This is # different from the case where `FULL` implies capture # attention while `PIECEWISE` implies no attention. force_attention = cudagraph_runtime_mode == CUDAGraphMode.FULL self._dummy_run( num_tokens, cudagraph_runtime_mode=CUDAGraphMode.NONE, force_attention=force_attention, uniform_decode=uniform_decode, allow_microbatching=allow_microbatching, skip_eplb=True, remove_lora=False, activate_lora=activate_lora, ) self._dummy_run( num_tokens, cudagraph_runtime_mode=cudagraph_runtime_mode, uniform_decode=uniform_decode, allow_microbatching=allow_microbatching, skip_eplb=True, remove_lora=False, activate_lora=activate_lora, is_graph_capturing=True, ) self.maybe_remove_all_loras(self.lora_config) def initialize_attn_backend(self, kv_cache_config: KVCacheConfig) -> None: """ Initialize the attention backends and attention metadata builders. """ assert len(self.attn_groups) == 0, "Attention backends are already initialized" class AttentionGroupKey(NamedTuple): attn_backend: type[AttentionBackend] kv_cache_spec: KVCacheSpec def get_attn_backends_for_group( kv_cache_group_spec: KVCacheGroupSpec, ) -> tuple[dict[AttentionGroupKey, list[str]], set[type[AttentionBackend]]]: layer_type = cast(type[Any], AttentionLayerBase) layers = get_layers_from_vllm_config( self.vllm_config, layer_type, kv_cache_group_spec.layer_names ) attn_backends = {} attn_backend_layers = defaultdict(list) # Dedupe based on full class name; this is a bit safer than # using the class itself as the key because when we create dynamic # attention backend subclasses (e.g. ChunkedLocalAttention) unless # they are cached correctly, there will be different objects per # layer. for layer_name in kv_cache_group_spec.layer_names: attn_backend = layers[layer_name].get_attn_backend() if layer_name in self.kv_sharing_fast_prefill_eligible_layers: attn_backend = create_fast_prefill_custom_backend( "FastPrefill", attn_backend, # type: ignore[arg-type] ) full_cls_name = attn_backend.full_cls_name() layer_kv_cache_spec = kv_cache_group_spec.kv_cache_spec if isinstance(layer_kv_cache_spec, UniformTypeKVCacheSpecs): layer_kv_cache_spec = layer_kv_cache_spec.kv_cache_specs[layer_name] key = (full_cls_name, layer_kv_cache_spec) attn_backends[key] = AttentionGroupKey( attn_backend, layer_kv_cache_spec ) attn_backend_layers[key].append(layer_name) return ( {attn_backends[k]: v for k, v in attn_backend_layers.items()}, set(group_key.attn_backend for group_key in attn_backends.values()), ) def create_attn_groups( attn_backends_map: dict[AttentionGroupKey, list[str]], kv_cache_group_id: int, ) -> list[AttentionGroup]: attn_groups: list[AttentionGroup] = [] for (attn_backend, kv_cache_spec), layer_names in attn_backends_map.items(): attn_group = AttentionGroup( attn_backend, layer_names, kv_cache_spec, kv_cache_group_id, ) attn_groups.append(attn_group) return attn_groups attention_backend_maps = [] attention_backend_list = [] for kv_cache_group_spec in kv_cache_config.kv_cache_groups: attn_backends = get_attn_backends_for_group(kv_cache_group_spec) attention_backend_maps.append(attn_backends[0]) attention_backend_list.append(attn_backends[1]) # Resolve cudagraph_mode before actually initialize metadata_builders self._check_and_update_cudagraph_mode( attention_backend_list, kv_cache_config.kv_cache_groups ) # Check if attention backend supports PCP&DCP and related features. check_attention_cp_compatibility(self.vllm_config) for i, attn_backend_map in enumerate(attention_backend_maps): self.attn_groups.append(create_attn_groups(attn_backend_map, i)) def initialize_metadata_builders( self, kv_cache_config: KVCacheConfig, kernel_block_sizes: list[int] ) -> None: """ Create the metadata builders for all KV cache groups and attn groups. """ for kv_cache_group_id in range(len(kv_cache_config.kv_cache_groups)): for attn_group in self.attn_groups[kv_cache_group_id]: attn_group.create_metadata_builders( self.vllm_config, self.device, kernel_block_sizes[kv_cache_group_id] if kv_cache_group_id < len(kernel_block_sizes) else None, num_metadata_builders=1 if not self.parallel_config.enable_dbo else 2, ) # Calculate reorder batch threshold (if needed) # Note (tdoublep): do this *after* constructing builders, # because some of them change the threshold at init time. self.calculate_reorder_batch_threshold() def _check_and_update_cudagraph_mode( self, attention_backends: list[set[type[AttentionBackend]]], kv_cache_groups: list[KVCacheGroupSpec], ) -> None: """ Resolve the cudagraph_mode when there are multiple attention groups with potential conflicting CUDA graph support. Then initialize the cudagraph_dispatcher based on the resolved cudagraph_mode. """ min_cg_support = AttentionCGSupport.ALWAYS min_cg_backend_name = None for attn_backend_set, kv_cache_group in zip( attention_backends, kv_cache_groups ): for attn_backend in attn_backend_set: builder_cls = attn_backend.get_builder_cls() cg_support = builder_cls.get_cudagraph_support( self.vllm_config, kv_cache_group.kv_cache_spec ) if cg_support.value < min_cg_support.value: min_cg_support = cg_support min_cg_backend_name = attn_backend.__name__ # Flexible resolve the cudagraph mode cudagraph_mode = self.compilation_config.cudagraph_mode assert cudagraph_mode is not None # check cudagraph for mixed batch is supported if ( cudagraph_mode.mixed_mode() == CUDAGraphMode.FULL and min_cg_support != AttentionCGSupport.ALWAYS ): msg = ( f"CUDAGraphMode.{cudagraph_mode.name} is not supported " f"with {min_cg_backend_name} backend (support: " f"{min_cg_support})" ) if min_cg_support == AttentionCGSupport.NEVER: # if not supported any full cudagraphs, just raise it. msg += ( "; please try cudagraph_mode=PIECEWISE, and " "make sure compilation mode is VLLM_COMPILE" ) raise ValueError(msg) # attempt to resolve the full cudagraph related mode if self.compilation_config.splitting_ops_contain_attention(): msg += "; setting cudagraph_mode=FULL_AND_PIECEWISE" cudagraph_mode = self.compilation_config.cudagraph_mode = ( CUDAGraphMode.FULL_AND_PIECEWISE ) else: msg += "; setting cudagraph_mode=FULL_DECODE_ONLY" cudagraph_mode = self.compilation_config.cudagraph_mode = ( CUDAGraphMode.FULL_DECODE_ONLY ) logger.warning(msg) # check that if we are doing decode full-cudagraphs it is supported if ( cudagraph_mode.decode_mode() == CUDAGraphMode.FULL and min_cg_support == AttentionCGSupport.NEVER ): msg = ( f"CUDAGraphMode.{cudagraph_mode.name} is not supported " f"with {min_cg_backend_name} backend (support: " f"{min_cg_support})" ) if self.compilation_config.mode == CompilationMode.VLLM_COMPILE and ( self.compilation_config.splitting_ops_contain_attention() or self.compilation_config.use_inductor_graph_partition ): msg += ( "; setting cudagraph_mode=PIECEWISE because " "attention is compiled piecewise" ) cudagraph_mode = self.compilation_config.cudagraph_mode = ( CUDAGraphMode.PIECEWISE ) else: msg += ( "; setting cudagraph_mode=NONE because " "attention is not compiled piecewise" ) cudagraph_mode = self.compilation_config.cudagraph_mode = ( CUDAGraphMode.NONE ) logger.warning(msg) # check that if we are doing spec-decode + decode full-cudagraphs it is # supported if ( cudagraph_mode.decode_mode() == CUDAGraphMode.FULL and self.uniform_decode_query_len > 1 and min_cg_support.value < AttentionCGSupport.UNIFORM_BATCH.value ): msg = ( f"CUDAGraphMode.{cudagraph_mode.name} is not supported" f" with spec-decode for attention backend " f"{min_cg_backend_name} (support: {min_cg_support})" ) if self.compilation_config.splitting_ops_contain_attention(): msg += "; setting cudagraph_mode=PIECEWISE" cudagraph_mode = self.compilation_config.cudagraph_mode = ( CUDAGraphMode.PIECEWISE ) else: msg += "; setting cudagraph_mode=NONE" cudagraph_mode = self.compilation_config.cudagraph_mode = ( CUDAGraphMode.NONE ) logger.warning(msg) # double check that we can support full cudagraph if they are requested # even after automatic downgrades if ( cudagraph_mode.has_full_cudagraphs() and min_cg_support == AttentionCGSupport.NEVER ): raise ValueError( f"CUDAGraphMode.{cudagraph_mode.name} is not " f"supported with {min_cg_backend_name} backend (" f"support:{min_cg_support}) " "; please try cudagraph_mode=PIECEWISE, " "and make sure compilation mode is VLLM_COMPILE" ) # if we have dedicated decode cudagraphs, and spec-decode is enabled, # we need to adjust the cudagraph sizes to be a multiple of the uniform # decode query length to avoid: https://github.com/vllm-project/vllm/issues/28207 # temp-fix: https://github.com/vllm-project/vllm/issues/28207#issuecomment-3504004536 # Will be removed in the near future when we have separate cudagraph capture # sizes for decode and mixed prefill-decode. if ( cudagraph_mode.decode_mode() == CUDAGraphMode.FULL and cudagraph_mode.separate_routine() and self.uniform_decode_query_len > 1 ): self.compilation_config.adjust_cudagraph_sizes_for_spec_decode( self.uniform_decode_query_len, self.parallel_config.tensor_parallel_size ) capture_sizes = self.compilation_config.cudagraph_capture_sizes self.cudagraph_batch_sizes = ( capture_sizes if capture_sizes is not None else [] ) # Trigger cudagraph dispatching keys initialization after # resolved cudagraph mode. self.compilation_config.cudagraph_mode = cudagraph_mode self.cudagraph_dispatcher.initialize_cudagraph_keys( cudagraph_mode, self.uniform_decode_query_len ) def calculate_reorder_batch_threshold(self) -> None: """ Choose the minimum reorder batch threshold from all attention groups. Backends should be able to support lower threshold then what they request just may have a performance penalty due to that backend treating decodes as prefills. """ min_none_high = lambda a, b: a if b is None else b if a is None else min(a, b) reorder_batch_thresholds: list[int | None] = [ group.get_metadata_builder().reorder_batch_threshold for group in self._attn_group_iterator() ] # If there are no attention groups (attention-free model) or no backend # reports a threshold, leave reordering disabled. if len(reorder_batch_thresholds) == 0: self.reorder_batch_threshold = None return self.reorder_batch_threshold = reduce(min_none_high, reorder_batch_thresholds) # type: ignore[assignment] @staticmethod def select_common_block_size( kv_manager_block_size: int, attn_groups: list[AttentionGroup] ) -> int: """ Select a block size that is supported by all backends and is a factor of kv_manager_block_size. If kv_manager_block_size is supported by all backends, return it directly. Otherwise, return the max supported size. Args: kv_manager_block_size: Block size of KV cache attn_groups: List of attention groups Returns: The selected block size Raises: ValueError: If no valid block size found """ def block_size_is_supported( backends: list[type[AttentionBackend]], block_size: int ) -> bool: """ Check if the block size is supported by all backends. """ for backend in backends: is_supported = False for supported_size in backend.get_supported_kernel_block_sizes(): if isinstance(supported_size, int): if block_size == supported_size: is_supported = True elif isinstance(supported_size, MultipleOf): if block_size % supported_size.base == 0: is_supported = True else: raise ValueError(f"Unknown supported size: {supported_size}") if not is_supported: return False return True backends = [group.backend for group in attn_groups] # Case 1: if the block_size of kv cache manager is supported by all backends, # return it directly if block_size_is_supported(backends, kv_manager_block_size): return kv_manager_block_size # Case 2: otherwise, the block_size must be an `int`-format supported size of # at least one backend. Iterate over all `int`-format supported sizes in # descending order and return the first one that is supported by all backends. # Simple proof: # If the supported size b is in MultipleOf(x_i) format for all attention # backends i, and b a factor of kv_manager_block_size, then # kv_manager_block_size also satisfies MultipleOf(x_i) for all i. We will # return kv_manager_block_size in case 1. all_int_supported_sizes = set( supported_size for backend in backends for supported_size in backend.get_supported_kernel_block_sizes() if isinstance(supported_size, int) ) for supported_size in sorted(all_int_supported_sizes, reverse=True): if kv_manager_block_size % supported_size != 0: continue if block_size_is_supported(backends, supported_size): return supported_size raise ValueError(f"No common block size for {kv_manager_block_size}. ") def may_reinitialize_input_batch( self, kv_cache_config: KVCacheConfig, kernel_block_sizes: list[int] ) -> None: """ Re-initialize the input batch if the block sizes are different from `[self.cache_config.block_size]`. This usually happens when there are multiple KV cache groups. Args: kv_cache_config: The KV cache configuration. kernel_block_sizes: The kernel block sizes for each KV cache group. """ block_sizes = [ kv_cache_group.kv_cache_spec.block_size for kv_cache_group in kv_cache_config.kv_cache_groups if not isinstance(kv_cache_group.kv_cache_spec, EncoderOnlyAttentionSpec) ] if block_sizes != [self.cache_config.block_size] or kernel_block_sizes != [ self.cache_config.block_size ]: assert self.cache_config.cpu_offload_gb == 0, ( "Cannot re-initialize the input batch when CPU weight " "offloading is enabled. See https://github.com/vllm-project/vllm/pull/18298 " # noqa: E501 "for more details." ) self.input_batch = InputBatch( max_num_reqs=self.max_num_reqs, max_model_len=max(self.max_model_len, self.max_encoder_len), max_num_batched_tokens=self.max_num_tokens, device=self.device, pin_memory=self.pin_memory, vocab_size=self.model_config.get_vocab_size(), block_sizes=block_sizes, kernel_block_sizes=kernel_block_sizes, is_spec_decode=bool(self.vllm_config.speculative_config), logitsprocs=self.input_batch.logitsprocs, logitsprocs_need_output_token_ids=self.input_batch.logitsprocs_need_output_token_ids, is_pooling_model=self.is_pooling_model, num_speculative_tokens=self.num_spec_tokens, ) def _allocate_kv_cache_tensors( self, kv_cache_config: KVCacheConfig ) -> dict[str, torch.Tensor]: """ Initializes the KV cache buffer with the correct size. The buffer needs to be reshaped to the desired shape before being used by the models. Args: kv_cache_config: The KV cache config Returns: dict[str, torch.Tensor]: A map between layer names to their corresponding memory buffer for KV cache. """ kv_cache_raw_tensors: dict[str, torch.Tensor] = {} for kv_cache_tensor in kv_cache_config.kv_cache_tensors: tensor = torch.zeros( kv_cache_tensor.size, dtype=torch.int8, device=self.device ) for layer_name in kv_cache_tensor.shared_by: kv_cache_raw_tensors[layer_name] = tensor layer_names = set() for group in kv_cache_config.kv_cache_groups: for layer_name in group.layer_names: if layer_name in self.runner_only_attn_layers: continue layer_names.add(layer_name) assert layer_names == set(kv_cache_raw_tensors.keys()), ( "Some layers are not correctly initialized" ) return kv_cache_raw_tensors def _attn_group_iterator(self) -> Iterator[AttentionGroup]: return itertools.chain.from_iterable(self.attn_groups) def _kv_cache_spec_attn_group_iterator(self) -> Iterator[AttentionGroup]: if not self.kv_cache_config.kv_cache_groups: return for attn_groups in self.attn_groups: yield from attn_groups def _prepare_kernel_block_sizes(self, kv_cache_config: KVCacheConfig) -> list[int]: """ Generate kernel_block_sizes that matches each block_size. For attention backends that support virtual block splitting, use the supported block sizes from the backend. For other backends (like Mamba), use the same block size (no splitting). Args: kv_cache_config: The KV cache configuration. Returns: list[int]: List of kernel block sizes for each cache group. """ kernel_block_sizes = [] for kv_cache_gid, kv_cache_group in enumerate(kv_cache_config.kv_cache_groups): kv_cache_spec = kv_cache_group.kv_cache_spec if isinstance(kv_cache_spec, UniformTypeKVCacheSpecs): # All layers in the UniformTypeKVCacheSpecs have the same type, # Pick an arbitrary one to dispatch. kv_cache_spec = next(iter(kv_cache_spec.kv_cache_specs.values())) if isinstance(kv_cache_spec, EncoderOnlyAttentionSpec): continue elif isinstance(kv_cache_spec, AttentionSpec): # This is an attention backend that supports virtual # block splitting. Get the supported block sizes from # all backends in the group. attn_groups = self.attn_groups[kv_cache_gid] kv_manager_block_size = kv_cache_group.kv_cache_spec.block_size selected_kernel_size = self.select_common_block_size( kv_manager_block_size, attn_groups ) kernel_block_sizes.append(selected_kernel_size) elif isinstance(kv_cache_spec, MambaSpec): # This is likely Mamba or other non-attention cache, # no splitting. kernel_block_sizes.append(kv_cache_spec.block_size) else: raise NotImplementedError( f"unknown kv cache spec {kv_cache_group.kv_cache_spec}" ) return kernel_block_sizes def _reshape_kv_cache_tensors( self, kv_cache_config: KVCacheConfig, kv_cache_raw_tensors: dict[str, torch.Tensor], kernel_block_sizes: list[int], ) -> dict[str, torch.Tensor]: """ Reshape the KV cache tensors to the desired shape and dtype. Args: kv_cache_config: The KV cache config kv_cache_raw_tensors: The KV cache buffer of each layer, with correct size but uninitialized shape. kernel_block_sizes: The kernel block sizes for each KV cache group. Returns: Dict[str, torch.Tensor]: A map between layer names to their corresponding memory buffer for KV cache. """ kv_caches: dict[str, torch.Tensor] = {} has_attn, has_mamba = False, False for group in self._kv_cache_spec_attn_group_iterator(): kv_cache_spec = group.kv_cache_spec attn_backend = group.backend if group.kv_cache_group_id == len(kernel_block_sizes): # There may be a last group for layers without kv cache. continue kernel_block_size = kernel_block_sizes[group.kv_cache_group_id] for layer_name in group.layer_names: if layer_name in self.runner_only_attn_layers: continue raw_tensor = kv_cache_raw_tensors[layer_name] assert raw_tensor.numel() % kv_cache_spec.page_size_bytes == 0 num_blocks = raw_tensor.numel() // kv_cache_spec.page_size_bytes if isinstance(kv_cache_spec, AttentionSpec): has_attn = True num_blocks_per_kv_block = ( kv_cache_spec.block_size // kernel_block_size ) kernel_num_blocks = num_blocks * num_blocks_per_kv_block kv_cache_shape = attn_backend.get_kv_cache_shape( kernel_num_blocks, kernel_block_size, kv_cache_spec.num_kv_heads, kv_cache_spec.head_size, cache_dtype_str=self.cache_config.cache_dtype, ) dtype = kv_cache_spec.dtype try: kv_cache_stride_order = attn_backend.get_kv_cache_stride_order() assert len(kv_cache_stride_order) == len(kv_cache_shape) except (AttributeError, NotImplementedError): kv_cache_stride_order = tuple(range(len(kv_cache_shape))) # The allocation respects the backend-defined stride order # to ensure the semantic remains consistent for each # backend. We first obtain the generic kv cache shape and # then permute it according to the stride order which could # result in a non-contiguous tensor. kv_cache_shape = tuple( kv_cache_shape[i] for i in kv_cache_stride_order ) # Maintain original KV shape view. inv_order = [ kv_cache_stride_order.index(i) for i in range(len(kv_cache_stride_order)) ] kv_caches[layer_name] = ( kv_cache_raw_tensors[layer_name] .view(dtype) .view(kv_cache_shape) .permute(*inv_order) ) elif isinstance(kv_cache_spec, MambaSpec): has_mamba = True raw_tensor = kv_cache_raw_tensors[layer_name] state_tensors = [] storage_offset_bytes = 0 for shape, dtype in zip(kv_cache_spec.shapes, kv_cache_spec.dtypes): dtype_size = get_dtype_size(dtype) num_element_per_page = ( kv_cache_spec.page_size_bytes // dtype_size ) target_shape = (num_blocks, *shape) stride = torch.empty(target_shape).stride() target_stride = (num_element_per_page, *stride[1:]) assert storage_offset_bytes % dtype_size == 0 tensor = torch.as_strided( raw_tensor.view(dtype), size=target_shape, stride=target_stride, storage_offset=storage_offset_bytes // dtype_size, ) state_tensors.append(tensor) storage_offset_bytes += stride[0] * dtype_size kv_caches[layer_name] = state_tensors else: raise NotImplementedError if has_attn and has_mamba: self._update_hybrid_attention_mamba_layout(kv_caches) return kv_caches def _update_hybrid_attention_mamba_layout( self, kv_caches: dict[str, torch.Tensor] ) -> None: """ Update the layout of attention layers from (2, num_blocks, ...) to (num_blocks, 2, ...). Args: kv_caches: The KV cache buffer of each layer. """ for group in self._kv_cache_spec_attn_group_iterator(): kv_cache_spec = group.kv_cache_spec for layer_name in group.layer_names: kv_cache = kv_caches[layer_name] if isinstance(kv_cache_spec, AttentionSpec) and kv_cache.shape[0] == 2: assert kv_cache.shape[1] != 2, ( "Fail to determine whether the layout is " "(2, num_blocks, ...) or (num_blocks, 2, ...) for " f"a tensor of shape {kv_cache.shape}" ) hidden_size = kv_cache.shape[2:].numel() kv_cache.as_strided_( size=kv_cache.shape, stride=(hidden_size, 2 * hidden_size, *kv_cache.stride()[2:]), ) def initialize_kv_cache_tensors( self, kv_cache_config: KVCacheConfig, kernel_block_sizes: list[int] ) -> dict[str, torch.Tensor]: """ Initialize the memory buffer for KV cache. Args: kv_cache_config: The KV cache config kernel_block_sizes: The kernel block sizes for each KV cache group. Returns: Dict[str, torch.Tensor]: A map between layer names to their corresponding memory buffer for KV cache. """ # Try creating KV caches optimized for kv-connector transfers cache_dtype = self.cache_config.cache_dtype if self.use_uniform_kv_cache(self.attn_groups, cache_dtype): kv_caches, cross_layers_kv_cache, attn_backend = ( self.allocate_uniform_kv_caches( kv_cache_config, self.attn_groups, cache_dtype, self.device, kernel_block_sizes, ) ) self.cross_layers_kv_cache = cross_layers_kv_cache self.cross_layers_attn_backend = attn_backend else: # Fallback to the general case # Initialize the memory buffer for KV cache kv_cache_raw_tensors = self._allocate_kv_cache_tensors(kv_cache_config) # Change the memory buffer to the desired shape kv_caches = self._reshape_kv_cache_tensors( kv_cache_config, kv_cache_raw_tensors, kernel_block_sizes ) # Set up cross-layer KV cache sharing for layer_name, target_layer_name in self.shared_kv_cache_layers.items(): logger.debug("%s reuses KV cache of %s", layer_name, target_layer_name) kv_caches[layer_name] = kv_caches[target_layer_name] num_attn_module = ( 2 if self.model_config.hf_config.model_type == "longcat_flash" else 1 ) bind_kv_cache( kv_caches, self.compilation_config.static_forward_context, self.kv_caches, num_attn_module, ) return kv_caches def maybe_add_kv_sharing_layers_to_kv_cache_groups( self, kv_cache_config: KVCacheConfig ) -> None: """ Add layers that re-use KV cache to KV cache group of its target layer. Mapping of KV cache tensors happens in `initialize_kv_cache_tensors()` """ if not self.shared_kv_cache_layers: # No cross-layer KV sharing, return return add_kv_sharing_layers_to_kv_cache_groups( self.shared_kv_cache_layers, kv_cache_config.kv_cache_groups, self.runner_only_attn_layers, ) if self.cache_config.kv_sharing_fast_prefill: # In You Only Cache Once (https://arxiv.org/abs/2405.05254) or other # similar KV sharing setups, only the layers that generate KV caches # are involved in the prefill phase, enabling prefill to early exit. attn_layers = get_layers_from_vllm_config(self.vllm_config, Attention) for layer_name in reversed(attn_layers): if layer_name in self.shared_kv_cache_layers: self.kv_sharing_fast_prefill_eligible_layers.add(layer_name) else: break def initialize_kv_cache(self, kv_cache_config: KVCacheConfig) -> None: """ Initialize KV cache based on `kv_cache_config`. Args: kv_cache_config: Configuration for the KV cache, including the KV cache size of each layer """ kv_cache_config = deepcopy(kv_cache_config) self.kv_cache_config = kv_cache_config self.may_add_encoder_only_layers_to_kv_cache_config() self.maybe_add_kv_sharing_layers_to_kv_cache_groups(kv_cache_config) self.initialize_attn_backend(kv_cache_config) # The kernel block size for all KV cache groups. For example, if # kv_cache_manager uses block_size 256 for a given group, but the attention # backends for that group only supports block_size 64, we will return # kernel_block_size 64 and split the 256-token-block to 4 blocks with 64 # tokens each. kernel_block_sizes = self._prepare_kernel_block_sizes(kv_cache_config) # create metadata builders self.initialize_metadata_builders(kv_cache_config, kernel_block_sizes) # Reinitialize need to after initialize_attn_backend self.may_reinitialize_input_batch(kv_cache_config, kernel_block_sizes) kv_caches = self.initialize_kv_cache_tensors( kv_cache_config, kernel_block_sizes ) if self.speculative_config and self.speculative_config.use_eagle(): assert isinstance(self.drafter, EagleProposer) # validate all draft model layers belong to the same kv cache # group self.drafter.validate_same_kv_cache_group(kv_cache_config) if has_kv_transfer_group(): kv_transfer_group = get_kv_transfer_group() if self.cross_layers_kv_cache is not None: assert self.cross_layers_attn_backend is not None kv_transfer_group.register_cross_layers_kv_cache( self.cross_layers_kv_cache, self.cross_layers_attn_backend ) else: kv_transfer_group.register_kv_caches(kv_caches) kv_transfer_group.set_host_xfer_buffer_ops(copy_kv_blocks) def may_add_encoder_only_layers_to_kv_cache_config(self) -> None: """ Add encoder-only layers to the KV cache config. """ block_size = self.vllm_config.cache_config.block_size encoder_only_attn_specs: dict[AttentionSpec, list[str]] = defaultdict(list) attn_layers = get_layers_from_vllm_config(self.vllm_config, Attention) for layer_name, attn_module in attn_layers.items(): if attn_module.attn_type == AttentionType.ENCODER_ONLY: attn_spec: AttentionSpec = EncoderOnlyAttentionSpec( block_size=block_size, num_kv_heads=attn_module.num_kv_heads, head_size=attn_module.head_size, dtype=self.kv_cache_dtype, ) encoder_only_attn_specs[attn_spec].append(layer_name) self.runner_only_attn_layers.add(layer_name) if len(encoder_only_attn_specs) > 0: assert len(encoder_only_attn_specs) == 1, ( "Only support one encoder-only attention spec now" ) spec, layer_names = encoder_only_attn_specs.popitem() self.kv_cache_config.kv_cache_groups.append( KVCacheGroupSpec(layer_names=layer_names, kv_cache_spec=spec) ) def get_kv_cache_spec(self) -> dict[str, KVCacheSpec]: """ Generates the KVCacheSpec by parsing the kv cache format from each Attention module in the static forward context. Returns: KVCacheSpec: A dictionary mapping layer names to their KV cache format. Layers that do not need KV cache are not included. """ if has_ec_transfer() and get_ec_transfer().is_producer: return {} kv_cache_spec: dict[str, KVCacheSpec] = {} layer_type = cast(type[Any], AttentionLayerBase) attn_layers = get_layers_from_vllm_config(self.vllm_config, layer_type) for layer_name, attn_module in attn_layers.items(): if isinstance(attn_module, Attention) and ( kv_tgt_layer := attn_module.kv_sharing_target_layer_name ): # The layer doesn't need its own KV cache and will use that of # the target layer. We skip creating a KVCacheSpec for it, so # that KV cache management logic will act as this layer does # not exist, and doesn't allocate KV cache for the layer. This # enables the memory saving of cross-layer kv sharing, allowing # a given amount of memory to accommodate longer context lengths # or enable more requests to be processed simultaneously. self.shared_kv_cache_layers[layer_name] = kv_tgt_layer continue # Skip modules that don't need KV cache (eg encoder-only attention) if spec := attn_module.get_kv_cache_spec(self.vllm_config): kv_cache_spec[layer_name] = spec return kv_cache_spec def _to_list(self, sampled_token_ids: torch.Tensor) -> list[list[int]]: # This is a short term mitigation for issue mentioned in # https://github.com/vllm-project/vllm/issues/22754. # `tolist` would trigger a cuda wise stream sync, which # would block other copy ops from other cuda streams. # A cuda event sync would avoid such a situation. Since # this is in the critical path of every single model # forward loop, this has caused perf issue for a disagg # setup. pinned = self.sampled_token_ids_pinned_cpu[: sampled_token_ids.shape[0]] pinned.copy_(sampled_token_ids, non_blocking=True) self.transfer_event.record() self.transfer_event.synchronize() return pinned.tolist()