Files
sglang/python/sglang/bench_latency.py
2024-07-17 13:24:43 -07:00

324 lines
10 KiB
Python

"""
Benchmark the latency of a given model. It accepts arguments similar to those of launch_server.py.
# Usage (latency test):
python -m sglang.bench_latency --model-path meta-llama/Meta-Llama-3-8B-Instruct --load-format dummy
# Usage (correctness test):
python -m sglang.bench_latency --model-path TinyLlama/TinyLlama-1.1B-Chat-v0.4 --correct
### Reference output:
prefill logits (first half) tensor([[-10.0312, -9.5000, 0.8936, ..., -4.9414, -3.2402, -3.3633],
[-10.0312, -9.5000, 0.8936, ..., -4.9414, -3.2402, -3.3633],
[ -9.1875, -10.2500, 2.7109, ..., -4.3359, -4.0664, -4.1328]],
device='cuda:0', dtype=torch.float16)
prefill logits (final) tensor([[-8.3203, -7.1211, 3.3379, ..., -4.9570, -4.1328, -3.4141],
[-8.9062, -9.0156, 4.1445, ..., -4.9922, -4.4961, -4.0742],
[-9.6328, -9.0547, 4.0117, ..., -5.3047, -4.7148, -4.4609]],
device='cuda:0', dtype=torch.float16)
<s> The capital of France is.
The capital of the United States is Washington, D.C.
<s> The capital of the United Kindom is.
The capital of the United Kingdom is London.
The capital of the
<s> Today is a sunny day and I like go for a walk in the park.
I'm going to the park
"""
import argparse
import dataclasses
import logging
import multiprocessing
import time
import numpy as np
import torch
import torch.distributed as dist
from sglang.srt.hf_transformers_utils import get_tokenizer
from sglang.srt.managers.controller.infer_batch import Batch, ForwardMode, Req
from sglang.srt.managers.controller.model_runner import ModelRunner
from sglang.srt.model_config import ModelConfig
from sglang.srt.sampling_params import SamplingParams
from sglang.srt.server_args import ServerArgs
from sglang.srt.utils import suppress_other_loggers
@dataclasses.dataclass
class BenchArgs:
batch_size: int = 1
input_len: int = 1024
output_len: int = 4
correctness_test: bool = False
# This is only used for correctness test
cut_len: int = 4
@staticmethod
def add_cli_args(parser: argparse.ArgumentParser):
parser.add_argument("--batch-size", type=int, default=BenchArgs.batch_size)
parser.add_argument("--input-len", type=int, default=BenchArgs.input_len)
parser.add_argument("--output-len", type=int, default=BenchArgs.output_len)
parser.add_argument("--correctness-test", action="store_true")
parser.add_argument("--cut-len", type=int, default=BenchArgs.cut_len)
@classmethod
def from_cli_args(cls, args: argparse.Namespace):
attrs = [attr.name for attr in dataclasses.fields(cls)]
return cls(**{attr: getattr(args, attr) for attr in attrs})
def load_model(server_args, tp_rank):
suppress_other_loggers()
rank_print = print if tp_rank == 0 else lambda *args, **kwargs: None
model_config = ModelConfig(path=server_args.model_path)
model_runner = ModelRunner(
model_config=model_config,
mem_fraction_static=server_args.mem_fraction_static,
gpu_id=tp_rank,
tp_rank=tp_rank,
tp_size=server_args.tp_size,
nccl_port=28888,
server_args=server_args,
)
rank_print(f"max_total_num_tokens={model_runner.max_total_num_tokens}")
tokenizer = get_tokenizer(
server_args.tokenizer_path,
tokenizer_mode=server_args.tokenizer_mode,
trust_remote_code=server_args.trust_remote_code,
)
if server_args.tp_size > 1:
dist.barrier()
return model_runner, tokenizer
def prepare_inputs(bench_args, tokenizer):
prompts = [
"The capital of France is",
"The capital of the United Kindom is",
"Today is a sunny day and I like",
]
input_ids = [tokenizer.encode(p) for p in prompts]
sampling_params = SamplingParams(
temperature=0,
max_new_tokens=BenchArgs.output_len,
)
reqs = []
for i in range(len(prompts)):
assert len(input_ids[i]) > bench_args.cut_len
tmp_input_ids = input_ids[i][: bench_args.cut_len]
req = Req(rid=i, origin_input_text=prompts[i], origin_input_ids=tmp_input_ids)
req.prefix_indices = []
req.sampling_params = sampling_params
req.input_ids = req.origin_input_ids
reqs.append(req)
return input_ids, reqs
def prepare_extend_inputs(bench_args, input_ids, reqs, model_runner):
for i in range(len(reqs)):
req = reqs[i]
req.input_ids += input_ids[i][bench_args.cut_len :]
req.prefix_indices = model_runner.req_to_token_pool.req_to_token[
i, : bench_args.cut_len
]
return reqs
def prepare_synthetic_inputs(bench_args, tokenizer):
input_ids = np.ones((bench_args.batch_size, bench_args.input_len), dtype=np.int32)
sampling_params = SamplingParams(
temperature=0,
max_new_tokens=BenchArgs.output_len,
)
reqs = []
for i in range(len(input_ids)):
req = Req(rid=i, origin_input_text="", origin_input_ids=list(input_ids[i]))
req.prefix_indices = []
req.sampling_params = sampling_params
req.input_ids = req.origin_input_ids
reqs.append(req)
return reqs
def extend(reqs, model_runner):
batch = Batch.init_new(
reqs=reqs,
req_to_token_pool=model_runner.req_to_token_pool,
token_to_kv_pool=model_runner.token_to_kv_pool,
tree_cache=None,
)
batch.prepare_for_extend(model_runner.model_config.vocab_size, None)
output = model_runner.forward(batch, ForwardMode.EXTEND)
next_token_ids = batch.sample(output.next_token_logits)
return next_token_ids, output.next_token_logits, batch
def decode(input_token_ids, batch, model_runner):
batch.prepare_for_decode(input_token_ids.cpu().numpy())
output = model_runner.forward(batch, ForwardMode.DECODE)
next_token_ids = batch.sample(output.next_token_logits)
return next_token_ids, output.next_token_logits
@torch.inference_mode()
def correctness_test(
server_args,
bench_args,
tp_rank,
):
rank_print = print if tp_rank == 0 else lambda *args, **kwargs: None
# Load the model
model_runner, tokenizer = load_model(server_args, tp_rank)
# Prepare inputs
input_ids, reqs = prepare_inputs(bench_args, tokenizer)
if bench_args.cut_len > 0:
# Prefill
next_token_ids, next_token_logits, batch = extend(reqs, model_runner)
rank_print("prefill logits (first half)", next_token_logits)
# Prepare extend inputs
reqs = prepare_extend_inputs(bench_args, input_ids, reqs, model_runner)
# Extend
next_token_ids, next_token_logits, batch = extend(reqs, model_runner)
rank_print("prefill logits (final)", next_token_logits)
# Decode
output_ids = [input_ids[i] + [next_token_ids[i]] for i in range(len(input_ids))]
for _ in range(bench_args.output_len):
next_token_ids, _ = decode(next_token_ids, batch, model_runner)
for i in range(len(reqs)):
output_ids[i].append(next_token_ids[i])
# Print
for i in range(len(reqs)):
rank_print(tokenizer.decode(output_ids[i]))
def latency_test(
server_args,
bench_args,
tp_rank,
):
rank_print = print if tp_rank == 0 else lambda *args, **kwargs: None
# Load the model
model_runner, tokenizer = load_model(server_args, tp_rank)
rank_print(
f"max_batch_size={model_runner.max_total_num_tokens // (bench_args.input_len + bench_args.output_len)}"
)
# Prepare inputs
reqs = prepare_synthetic_inputs(bench_args, tokenizer)
def clear():
model_runner.req_to_token_pool.clear()
model_runner.token_to_kv_pool.clear()
@torch.inference_mode()
def run_once(output_len):
# Prefill
torch.cuda.synchronize()
tot_latency = 0
tic = time.time()
next_token_ids, _, batch = extend(reqs, model_runner)
torch.cuda.synchronize()
prefill_latency = time.time() - tic
tot_latency += prefill_latency
throughput = bench_args.input_len * bench_args.batch_size / prefill_latency
rank_print(
f"Prefill. latency: {prefill_latency:6.5f} s, throughput: {throughput:9.2f} token/s"
)
# Decode
for i in range(output_len):
torch.cuda.synchronize()
tic = time.time()
next_token_ids, _ = decode(next_token_ids, batch, model_runner)
torch.cuda.synchronize()
latency = time.time() - tic
tot_latency += latency
throughput = bench_args.batch_size / latency
if i < 5:
rank_print(
f"Decode. latency: {latency:6.5f} s, throughput: {throughput:9.2f} token/s"
)
avg_decode_latency = (tot_latency - prefill_latency) / output_len
avg_decode_throughput = bench_args.batch_size / avg_decode_latency
rank_print(
f"Decode. avg latency: {avg_decode_latency:6.5f} s, avg throughput: {avg_decode_throughput:9.2f} token/s"
)
throughput = (
(bench_args.input_len + bench_args.output_len)
* bench_args.batch_size
/ tot_latency
)
rank_print(
f"Total. latency: {tot_latency:6.3f} s, throughput: {throughput:9.2f} token/s"
)
# Warm up
run_once(4)
clear()
# Run again
run_once(bench_args.output_len)
def main(server_args, bench_args):
print(bench_args)
if bench_args.correctness_test:
work_func = correctness_test
else:
work_func = latency_test
if server_args.tp_size == 1:
work_func(server_args, bench_args, 0)
else:
workers = []
for tp_rank in range(server_args.tp_size):
proc = multiprocessing.Process(
target=work_func,
args=(
server_args,
bench_args,
tp_rank,
),
)
proc.start()
workers.append(proc)
for proc in workers:
proc.join()
proc.terminate()
if __name__ == "__main__":
parser = argparse.ArgumentParser()
ServerArgs.add_cli_args(parser)
BenchArgs.add_cli_args(parser)
args = parser.parse_args()
server_args = ServerArgs.from_cli_args(args)
bench_args = BenchArgs.from_cli_args(args)
logging.basicConfig(
level=getattr(logging, server_args.log_level.upper()),
format="%(message)s",
)
main(server_args, bench_args)