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[gpt-oss] Add gpt-oss bf16 support

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wangjing
2025-08-13 21:25:57 +08:00
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commit 17ea2ec6aa
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# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
"""A GPU worker class."""
import gc
import os
from typing import Dict, List, Optional, Set, Tuple, Type, Union
import torch
import torch.distributed
import vllm.envs as envs
from vllm.config import VllmConfig
from vllm.device_allocator.cumem import CuMemAllocator
from vllm.distributed import (ensure_model_parallel_initialized,
init_distributed_environment,
set_custom_all_reduce)
from vllm.distributed.kv_transfer import ensure_kv_transfer_initialized
from vllm.logger import init_logger
from vllm.lora.request import LoRARequest
from vllm.model_executor import set_random_seed
from vllm.model_executor.layers.sampler import SamplerOutput
from vllm.model_executor.model_loader.tensorizer import TensorizerConfig
from vllm.platforms import current_platform
from vllm.prompt_adapter.request import PromptAdapterRequest
from vllm.sequence import (ExecuteModelRequest, IntermediateTensors,
SequenceGroupMetadata, SequenceGroupMetadataDelta)
from vllm.utils import (GiB_bytes, MemorySnapshot, bind_kv_cache,
memory_profiling)
from vllm.worker.cache_engine import CacheEngine
from vllm.worker.enc_dec_model_runner import EncoderDecoderModelRunner
from vllm.worker.model_runner import GPUModelRunnerBase, ModelRunner
from vllm.worker.pooling_model_runner import PoolingModelRunner
from vllm.worker.worker_base import (LocalOrDistributedWorkerBase, WorkerBase,
WorkerInput)
logger = init_logger(__name__)
class Worker(LocalOrDistributedWorkerBase):
"""A worker class that executes (a partition of) the model on a GPU.
Each worker is associated with a single GPU. The worker is responsible for
maintaining the KV cache and executing the model on the GPU. In case of
distributed inference, each worker is assigned a partition of the model.
"""
def __init__(
self,
vllm_config: VllmConfig,
local_rank: int,
rank: int,
distributed_init_method: str,
is_driver_worker: bool = False,
model_runner_cls: Optional[Type[GPUModelRunnerBase]] = None,
) -> None:
WorkerBase.__init__(self, vllm_config)
self.parallel_config.rank = rank
self.local_rank = local_rank
self.rank = rank
self.distributed_init_method = distributed_init_method
self.is_driver_worker = is_driver_worker
if self.model_config.trust_remote_code:
# note: lazy import to avoid importing torch before initializing
from vllm.utils import init_cached_hf_modules
init_cached_hf_modules()
# Return hidden states from target model if the draft model is an
# mlp_speculator
speculative_config = self.speculative_config
model_config = self.model_config
speculative_args = {} if speculative_config is None \
or (speculative_config.draft_model_config.hf_config.model_type ==
model_config.hf_config.model_type) \
or (speculative_config.draft_model_config.hf_config.model_type
not in ("medusa",
"mlp_speculator",
"eagle",
"deepseek_mtp",
"mimo_mtp")) \
else {"return_hidden_states": True}
ModelRunnerClass: Type[GPUModelRunnerBase] = ModelRunner
if model_config.runner_type == "pooling":
ModelRunnerClass = PoolingModelRunner
elif self.model_config.is_encoder_decoder:
ModelRunnerClass = EncoderDecoderModelRunner
self.model_runner: GPUModelRunnerBase = ModelRunnerClass(
vllm_config=self.vllm_config,
kv_cache_dtype=self.cache_config.cache_dtype,
is_driver_worker=is_driver_worker,
**speculative_args,
)
if model_runner_cls is not None:
self.model_runner = model_runner_cls(self.model_runner)
# Uninitialized cache engine. Will be initialized by
# initialize_cache.
self.cache_engine: List[CacheEngine]
# Initialize gpu_cache as pooling models don't initialize kv_caches
self.gpu_cache: Optional[List[List[torch.Tensor]]] = None
self._seq_group_metadata_cache: Dict[str, SequenceGroupMetadata] = {}
# Buffers saved before sleep
self._sleep_saved_buffers: Dict[str, torch.Tensor] = {}
# Torch profiler. Enabled and configured through env vars:
# VLLM_TORCH_PROFILER_DIR=/path/to/save/trace
if envs.VLLM_TORCH_PROFILER_DIR:
torch_profiler_trace_dir = envs.VLLM_TORCH_PROFILER_DIR
logger.info("Profiling enabled. Traces will be saved to: %s",
torch_profiler_trace_dir)
self.profiler = torch.profiler.profile(
activities=[
torch.profiler.ProfilerActivity.CPU,
torch.profiler.ProfilerActivity.CUDA,
],
with_stack=True,
on_trace_ready=torch.profiler.tensorboard_trace_handler(
torch_profiler_trace_dir, use_gzip=True))
else:
self.profiler = None
def start_profile(self):
if self.profiler is None:
raise RuntimeError("Profiler is not enabled.")
self.profiler.start()
def stop_profile(self):
if self.profiler is None:
raise RuntimeError("Profiler is not enabled.")
self.profiler.stop()
print(
self.profiler.key_averages().table(sort_by="self_cuda_time_total"))
def sleep(self, level: int = 1) -> None:
free_bytes_before_sleep = torch.cuda.mem_get_info()[0]
# Save the buffers before level 2 sleep
if level == 2:
model = self.model_runner.model
self._sleep_saved_buffers = {
name: buffer.cpu().clone()
for name, buffer in model.named_buffers()
}
allocator = CuMemAllocator.get_instance()
allocator.sleep(offload_tags=("weights", ) if level == 1 else tuple())
free_bytes_after_sleep, total = torch.cuda.mem_get_info()
freed_bytes = free_bytes_after_sleep - free_bytes_before_sleep
used_bytes = total - free_bytes_after_sleep
assert freed_bytes >= 0, "Memory usage increased after sleeping."
logger.info(
"Sleep mode freed %.2f GiB memory, "
"%.2f GiB memory is still in use.", freed_bytes / GiB_bytes,
used_bytes / GiB_bytes)
def wake_up(self, tags: Optional[list[str]] = None) -> None:
allocator = CuMemAllocator.get_instance()
allocator.wake_up(tags=tags)
# Restore the buffers after level 2 sleep
if len(self._sleep_saved_buffers):
model = self.model_runner.model
for name, buffer in model.named_buffers():
if name in self._sleep_saved_buffers:
buffer.data.copy_(self._sleep_saved_buffers[name].data)
self._sleep_saved_buffers = {}
def init_device(self) -> None:
if self.device_config.device.type == "cuda":
# torch.distributed.all_reduce does not free the input tensor until
# the synchronization point. This causes the memory usage to grow
# as the number of all_reduce calls increases. This env var disables
# this behavior.
# Related issue:
# https://discuss.pytorch.org/t/cuda-allocation-lifetime-for-inputs-to-distributed-all-reduce/191573
os.environ["TORCH_NCCL_AVOID_RECORD_STREAMS"] = "1"
# This env var set by Ray causes exceptions with graph building.
os.environ.pop("NCCL_ASYNC_ERROR_HANDLING", None)
self.device = torch.device(f"cuda:{self.local_rank}")
torch.cuda.set_device(self.device)
_check_if_gpu_supports_dtype(self.model_config.dtype)
gc.collect()
torch.cuda.empty_cache()
torch.cuda.reset_peak_memory_stats()
self.baseline_snapshot = MemorySnapshot()
else:
raise RuntimeError(
f"Not support device type: {self.device_config.device}")
# Initialize the distributed environment.
init_worker_distributed_environment(self.vllm_config, self.rank,
self.distributed_init_method,
self.local_rank)
# Set random seed.
set_random_seed(self.model_config.seed)
def load_model(self):
if self.vllm_config.model_config.enable_sleep_mode:
allocator = CuMemAllocator.get_instance()
assert allocator.get_current_usage() == 0, (
"Sleep mode can only be "
"used for one instance per process.")
context = allocator.use_memory_pool(tag="weights")
else:
from contextlib import nullcontext
context = nullcontext()
with context:
self.model_runner.load_model()
def save_sharded_state(
self,
path: str,
pattern: Optional[str] = None,
max_size: Optional[int] = None,
) -> None:
self.model_runner.save_sharded_state(
path,
pattern=pattern,
max_size=max_size,
)
def save_tensorized_model(
self,
tensorizer_config: TensorizerConfig,
) -> None:
self.model_runner.save_tensorized_model(
tensorizer_config=tensorizer_config, )
@torch.inference_mode()
def determine_num_available_blocks(self) -> Tuple[int, int]:
"""Profiles the peak memory usage of the model to determine how many
KV blocks may be allocated without OOMs.
The engine will first conduct a profiling of the existing memory usage.
Then, it calculate the maximum possible number of GPU and CPU blocks
that can be allocated with the remaining free memory.
Tip:
You may limit the usage of GPU memory
by adjusting the `gpu_memory_utilization` parameter.
"""
# Profile the memory usage of the model and get the maximum number of
# cache blocks that can be allocated with the remaining free memory.
torch.cuda.empty_cache()
torch.cuda.reset_peak_memory_stats()
free_memory_pre_profile, total_gpu_memory = torch.cuda.mem_get_info()
# Execute a forward pass with dummy inputs to profile the memory usage
# of the model.
with memory_profiling(
self.baseline_snapshot,
weights_memory=self.model_runner.model_memory_usage) as result:
self.model_runner.profile_run()
self._assert_memory_footprint_increased_during_profiling()
memory_for_current_instance = total_gpu_memory * \
self.cache_config.gpu_memory_utilization
available_kv_cache_memory = (memory_for_current_instance -
result.non_kv_cache_memory)
# Calculate the number of blocks that can be allocated with the
# profiled peak memory.
cache_block_size = self.get_cache_block_size_bytes()
if cache_block_size == 0:
num_gpu_blocks = 0
num_cpu_blocks = 0
else:
num_gpu_blocks = int(available_kv_cache_memory // cache_block_size)
num_cpu_blocks = int(self.cache_config.swap_space_bytes //
cache_block_size)
num_gpu_blocks = max(num_gpu_blocks, 0)
num_cpu_blocks = max(num_cpu_blocks, 0)
msg = (f"Memory profiling takes {result.profile_time:.2f} seconds\n"
"the current vLLM instance can use "
"total_gpu_memory "
f"({(total_gpu_memory / GiB_bytes):.2f}GiB)"
" x gpu_memory_utilization "
f"({self.cache_config.gpu_memory_utilization:.2f})"
f" = {(memory_for_current_instance / GiB_bytes):.2f}GiB\n"
"model weights take "
f"{(result.weights_memory / GiB_bytes):.2f}GiB;"
" non_torch_memory takes "
f"{(result.non_torch_increase / GiB_bytes):.2f}GiB;"
" PyTorch activation peak memory takes "
f"{(result.torch_peak_increase / GiB_bytes):.2f}GiB;"
" the rest of the memory reserved for KV Cache is "
f"{(available_kv_cache_memory / GiB_bytes):.2f}GiB.")
logger.info(msg)
# Final cleanup
gc.collect()
return num_gpu_blocks, num_cpu_blocks
def _assert_memory_footprint_increased_during_profiling(self):
# NOTE(woosuk): Here we assume that the other processes using the same
# GPU did not change their memory usage during the profiling.
free_gpu_memory, total = torch.cuda.mem_get_info()
cuda_memory = total - free_gpu_memory
assert self.baseline_snapshot.cuda_memory < cuda_memory, (
"Error in memory profiling. "
f"Initial used memory {self.baseline_snapshot.cuda_memory}, "
f"currently used memory {cuda_memory}. "
f"This happens when the GPU memory was "
"not properly cleaned up before initializing the vLLM instance.")
def initialize_cache(self, num_gpu_blocks: int,
num_cpu_blocks: int) -> None:
"""Allocate GPU and CPU KV cache with the specified number of blocks.
This also warms up the model, which may record CUDA graphs.
"""
raise_if_cache_size_invalid(
num_gpu_blocks, self.cache_config.block_size,
self.cache_config.is_attention_free,
self.model_config.max_model_len,
self.parallel_config.pipeline_parallel_size)
self.cache_config.num_gpu_blocks = num_gpu_blocks
self.cache_config.num_cpu_blocks = num_cpu_blocks
if self.vllm_config.model_config.enable_sleep_mode:
allocator = CuMemAllocator.get_instance()
context = allocator.use_memory_pool(tag="kv_cache")
else:
from contextlib import nullcontext
context = nullcontext()
with context:
self._init_cache_engine()
self._warm_up_model()
def _init_cache_engine(self):
assert self.cache_config.num_gpu_blocks is not None
self.cache_engine = [
CacheEngine(self.cache_config, self.model_config,
self.parallel_config, self.device_config)
for _ in range(self.parallel_config.pipeline_parallel_size)
]
self.gpu_cache = [
self.cache_engine[ve].gpu_cache
for ve in range(self.parallel_config.pipeline_parallel_size)
]
bind_kv_cache(self.compilation_config.static_forward_context,
self.gpu_cache)
def _warm_up_model(self) -> None:
# warm up sizes that are not in cudagraph capture sizes,
# but users still want to compile for better performance,
# e.g. for the max-num-batched token size in chunked prefill.
warmup_sizes = self.vllm_config.compilation_config.compile_sizes.copy()
if not self.model_config.enforce_eager:
warmup_sizes = [
x for x in warmup_sizes if x not in
self.vllm_config.compilation_config.cudagraph_capture_sizes
]
for size in sorted(warmup_sizes, reverse=True):
logger.info("Compile and warming up model for size %d", size)
self.model_runner._dummy_run(size)
if not self.model_config.enforce_eager:
self.model_runner.capture_model(self.gpu_cache)
# Reset the seed to ensure that the random state is not affected by
# the model initialization and profiling.
set_random_seed(self.model_config.seed)
@property
def do_metadata_broadcast(self) -> bool:
return self.parallel_config.tensor_parallel_size > 1
@property
def kv_cache(self) -> Optional[List[List[torch.Tensor]]]:
return self.gpu_cache
@torch.inference_mode()
def prepare_worker_input(
self, execute_model_req: ExecuteModelRequest) -> WorkerInput:
virtual_engine = execute_model_req.virtual_engine
num_steps = execute_model_req.num_steps
num_seq_groups = len(execute_model_req.seq_group_metadata_list)
# `blocks_to_swap_in` and `blocks_to_swap_out` are cpu tensors.
# they contain parameters to launch cudamemcpyasync.
blocks_to_swap_in = torch.tensor(execute_model_req.blocks_to_swap_in,
device="cpu",
dtype=torch.int64).view(-1, 2)
blocks_to_swap_out = torch.tensor(execute_model_req.blocks_to_swap_out,
device="cpu",
dtype=torch.int64).view(-1, 2)
# `blocks_to_copy` is a gpu tensor. The src and tgt of
# blocks to copy are in the same device, and `blocks_to_copy`
# can be used directly within cuda kernels.
blocks_to_copy = torch.tensor(execute_model_req.blocks_to_copy,
device=self.device,
dtype=torch.int64).view(-1, 2)
return WorkerInput(
num_seq_groups=num_seq_groups,
blocks_to_swap_in=blocks_to_swap_in,
blocks_to_swap_out=blocks_to_swap_out,
blocks_to_copy=blocks_to_copy,
virtual_engine=virtual_engine,
num_steps=num_steps,
)
@torch.inference_mode()
def execute_worker(self, worker_input: WorkerInput) -> None:
virtual_engine = worker_input.virtual_engine
# Issue cache operations.
if (worker_input.blocks_to_swap_in is not None
and worker_input.blocks_to_swap_in.numel() > 0):
self.cache_engine[virtual_engine].swap_in(
worker_input.blocks_to_swap_in)
if (worker_input.blocks_to_swap_out is not None
and worker_input.blocks_to_swap_out.numel() > 0):
self.cache_engine[virtual_engine].swap_out(
worker_input.blocks_to_swap_out)
if (worker_input.blocks_to_copy is not None
and worker_input.blocks_to_copy.numel() > 0):
self.cache_engine[virtual_engine].copy(worker_input.blocks_to_copy)
def _get_cached_seq_group_metadata(
self,
seq_group_metadata_list: List[Union[SequenceGroupMetadata,
SequenceGroupMetadataDelta]],
finished_request_ids: List[str]) -> List[SequenceGroupMetadata]:
"""Return a list of cached Sequence Group Metadata after updating its
state.
It is used because scheduler only sends delta to workers to reduce
the data payload size. The function also cleans up cache based on
a given `finished_request_ids`.
"""
new_seq_group_metadata_list = []
for metadata_or_delta in seq_group_metadata_list:
request_id = metadata_or_delta.request_id
if request_id not in self._seq_group_metadata_cache:
# The first prefill.
assert isinstance(metadata_or_delta, SequenceGroupMetadata)
self._seq_group_metadata_cache[request_id] = metadata_or_delta
else:
# The first prefill is already cached.
if isinstance(metadata_or_delta, SequenceGroupMetadataDelta):
self._seq_group_metadata_cache[request_id].apply_delta(
metadata_or_delta)
else:
# If metadata snapshot is sent again, it is
# preempted. Reset the cache because we need to start
# from scratch.
assert isinstance(metadata_or_delta, SequenceGroupMetadata)
self._seq_group_metadata_cache[
request_id] = metadata_or_delta
new_seq_group_metadata_list.append(
self._seq_group_metadata_cache[request_id])
# Clean up finished ids
for finished_id in finished_request_ids:
del self._seq_group_metadata_cache[finished_id]
return new_seq_group_metadata_list
def _execute_model_spmd(
self,
execute_model_req: ExecuteModelRequest,
intermediate_tensors: Optional[IntermediateTensors] = None,
) -> Optional[List[SamplerOutput]]:
if execute_model_req is not None:
new_seq_group_metadata_list = self._get_cached_seq_group_metadata(
execute_model_req.seq_group_metadata_list,
execute_model_req.finished_requests_ids)
execute_model_req.seq_group_metadata_list = (
new_seq_group_metadata_list)
output = super()._execute_model_spmd(execute_model_req,
intermediate_tensors)
return output
def add_lora(self, lora_request: LoRARequest) -> bool:
return self.model_runner.add_lora(lora_request)
def remove_lora(self, lora_id: int) -> bool:
return self.model_runner.remove_lora(lora_id)
def pin_lora(self, lora_id: int) -> bool:
return self.model_runner.pin_lora(lora_id)
def list_loras(self) -> Set[int]:
return self.model_runner.list_loras()
def add_prompt_adapter(
self, prompt_adapter_request: PromptAdapterRequest) -> bool:
return self.model_runner.add_prompt_adapter(prompt_adapter_request)
def remove_prompt_adapter(self, prompt_adapter_id: int) -> bool:
return self.model_runner.remove_lora(prompt_adapter_id)
def pin_prompt_adapter(self, prompt_adapter_id: int) -> bool:
return self.model_runner.pin_prompt_adapter(prompt_adapter_id)
def list_prompt_adapters(self) -> Set[int]:
return self.model_runner.list_prompt_adapters()
@property
def max_model_len(self) -> int:
return self.model_config.max_model_len
@property
def vocab_size(self) -> int:
return self.model_runner.vocab_size
def get_cache_block_size_bytes(self) -> int:
"""Get the size of the KV cache block size in bytes.
"""
return CacheEngine.get_cache_block_size(self.cache_config,
self.model_config,
self.parallel_config)
def init_worker_distributed_environment(
vllm_config: VllmConfig,
rank: int,
distributed_init_method: Optional[str] = None,
local_rank: int = -1,
) -> None:
"""Initialize the distributed environment."""
parallel_config = vllm_config.parallel_config
set_custom_all_reduce(not parallel_config.disable_custom_all_reduce)
init_distributed_environment(parallel_config.world_size, rank,
distributed_init_method, local_rank)
ensure_model_parallel_initialized(parallel_config.tensor_parallel_size,
parallel_config.pipeline_parallel_size)
ensure_kv_transfer_initialized(vllm_config)
def _check_if_gpu_supports_dtype(torch_dtype: torch.dtype):
# Check if the GPU supports the dtype.
if torch_dtype == torch.bfloat16: # noqa: SIM102
if not current_platform.has_device_capability(80):
capability = current_platform.get_device_capability()
gpu_name = current_platform.get_device_name()
if capability is None:
compute_str = "does not have a compute capability"
else:
version_str = capability.as_version_str()
compute_str = f"has compute capability {version_str}"
raise ValueError(
"Bfloat16 is only supported on GPUs with compute capability "
f"of at least 8.0. Your {gpu_name} GPU {compute_str}. "
"You can use float16 instead by explicitly setting the "
"`dtype` flag in CLI, for example: --dtype=half.")
def raise_if_cache_size_invalid(num_gpu_blocks, block_size, is_attention_free,
max_model_len, pipeline_parallel_size) -> None:
if is_attention_free and num_gpu_blocks != 0:
raise ValueError("No memory should be allocated for the cache blocks "
f"for an attention-free model, but {num_gpu_blocks} "
"blocks are allocated.")
if not is_attention_free and num_gpu_blocks <= 0:
raise ValueError("No available memory for the cache blocks. "
"Try increasing `gpu_memory_utilization` when "
"initializing the engine.")
max_seq_len = block_size * (num_gpu_blocks // pipeline_parallel_size)
if not is_attention_free and max_model_len > max_seq_len:
raise ValueError(
f"The model's max seq len ({max_model_len}) "
"is larger than the maximum number of tokens that can be "
f"stored in KV cache ({max_seq_len}). Try increasing "
"`gpu_memory_utilization` or decreasing `max_model_len` when "
"initializing the engine.")