# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
"""Benchmark offline inference throughput."""
import argparse
import dataclasses
import json
import os
import random
import time
import warnings
from typing import Any, Optional, Union
import torch
import uvloop
from tqdm import tqdm
from transformers import AutoModelForCausalLM, AutoTokenizer, PreTrainedTokenizerBase
from benchmark_dataset import
(
AIMODataset,
BurstGPTDataset,
ConversationDataset,
InstructCoderDataset,
RandomDataset,
SampleRequest,
ShareGPTDataset,
SonnetDataset,
VisionArenaDataset,
)
from benchmark_utils import convert_to_pytorch_benchmark_format, write_to_json
from vllm.engine.arg_utils import AsyncEngineArgs, EngineArgs
from vllm.entrypoints.openai.api_server import
(
build_async_engine_client_from_engine_args,
)
from vllm.inputs import TextPrompt, TokensPrompt
from vllm.lora.request import LoRARequest
from vllm.outputs import RequestOutput
from vllm.sampling_params import BeamSearchParams
from vllm.utils import FlexibleArgumentParser,
merge_async_iterators
def run_vllm
(
requests: list[SampleRequest],
n: int,
engine_args: EngineArgs,
disable_detokenize: bool = False,
) -> tuple[float, Optional[list[RequestOutput]]]:
from vllm import LLM, SamplingParams
llm = LLM
(**dataclasses.asdict
(engine_args
))
assert all
(
llm.llm_engine.model_config.
max_model_len
>=
(request.prompt_len
+ request.expected_output_len
)
for request in requests
),
(
"Please ensure that
max_model_len is greater than the sum of"
" prompt_len and expected_output_len for all requests."
)
# Add the requests to the engine.
prompts: list[Union[TextPrompt, TokensPrompt]] = []
sampling_params: list[SamplingParams] = []
for request in requests:
prompts.append
(
TokensPrompt
(
prompt_token_ids=request.prompt["prompt_token_ids"],
multi_modal_data=request.multi_modal_data,
)
if "prompt_token_ids" in request.prompt
else TextPrompt
(
prompt=request.prompt, multi_modal_data=request.multi_modal_data
)
)
sampling_params.append
(
SamplingParams
(
n=n,
temperature=1.0,
top_p=1.0,
ignore_eos=True,
max_tokens=request.expected_output_len,
detokenize=not disable_detokenize,
)
)
lora_requests: Optional[list[LoRARequest]] = None
if engine_args.enable_lora:
lora_requests = [request.lora_request for request in requests]
use_beam_search = False
outputs = None
if not use_beam_search:
start = time.perf_counter
()
outputs = llm.generate
(
prompts, sampling_params, lora_request=lora_requests, use_tqdm=True
)
end = time.perf_counter
()
else:
assert lora_requests is None, "BeamSearch API does not support LoRA"
prompts = [request.prompt for request in requests]
# output_len should be the same for all requests.
output_len = requests[0].expected_output_len
for request in requests:
assert request.expected_output_len == output_len
start = time.perf_counter
()
llm.beam_search
(
prompts,
BeamSearchParams
(
beam_width=n,
max_tokens=output_len,
ignore_eos=True,
),
)
end = time.perf_counter
()
return end - start, outputs
def run_vllm_chat
(
requests: list[SampleRequest],
n: int,
engine_args: EngineArgs,
disable_detokenize: bool = False,
) -> tuple[float, list[RequestOutput]]:
"""
Run vLLM chat benchmark. This function is recommended ONLY for benchmarking
multimodal models as it properly handles multimodal inputs and chat
formatting. For non-multimodal models, use run_vllm
() instead.
"""
from vllm import LLM, SamplingParams
llm = LLM
(**dataclasses.asdict
(engine_args
))
assert all
(
llm.llm_engine.model_config.
max_model_len
>=
(request.prompt_len
+ request.expected_output_len
)
for request in requests
),
(
"Please ensure that
max_model_len is greater than the sum of "
"prompt_len and expected_output_len for all requests."
)
prompts = []
sampling_params: list[SamplingParams] = []
for request in requests:
prompts.append
(request.prompt
)
sampling_params.append
(
SamplingParams
(
n=n,
temperature=1.0,
top_p=1.0,
ignore_eos=True,
max_tokens=request.expected_output_len,
detokenize=not disable_detokenize,
)
)
start = time.perf_counter
()
outputs = llm.chat
(prompts, sampling_params, use_tqdm=True
)
end = time.perf_counter
()
return end - start, outputs
async def run_vllm_async
(
requests: list[SampleRequest],
n: int,
engine_args: AsyncEngineArgs,
disable_frontend_multiprocessing: bool = False,
disable_detokenize: bool = False,
) -> float:
from vllm import SamplingParams
async with build_async_engine_client_from_engine_args
(
engine_args, disable_frontend_multiprocessing
) as llm:
model_config = await llm.get_model_config
()
assert all
(
model_config.
max_model_len
>=
(request.prompt_len
+ request.expected_output_len
)
for request in requests
),
(
"Please ensure that
max_model_len is greater than the sum of"
" prompt_len and expected_output_len for all requests."
)
# Add the requests to the engine.
prompts: list[Union[TextPrompt, TokensPrompt]] = []
sampling_params: list[SamplingParams] = []
lora_requests: list[Optional[LoRARequest]] = []
for request in requests:
prompts.append
(
TokensPrompt
(
prompt_token_ids=request.prompt["prompt_token_ids"],
multi_modal_data=request.multi_modal_data,
)
if "prompt_token_ids" in request.prompt
else TextPrompt
(
prompt=request.prompt, multi_modal_data=request.multi_modal_data
)
)
sampling_params.append
(
SamplingParams
(
n=n,
temperature=1.0,
top_p=1.0,
ignore_eos=True,
max_tokens=request.expected_output_len,
detokenize=not disable_detokenize,
)
)
lora_requests.append
(request.lora_request
)
generators = []
start = time.perf_counter
()
for i,
(prompt, sp, lr
) in enumerate
(
zip
(prompts, sampling_params, lora_requests
)
):
generator = llm.generate
(prompt, sp, lora_request=lr, request_id=f"test{i}"
)
generators.append
(generator
)
all_gens =
merge_async_iterators
(*generators
)
async for i, res in all_gens:
pass
end = time.perf_counter
()
return end - start
def run_hf
(
requests: list[SampleRequest],
model: str,
tokenizer: PreTrainedTokenizerBase,
n: int,
max_batch_size: int,
trust_remote_code: bool,
disable_detokenize: bool = False,
) -> float:
llm = AutoModelForCausalLM.from_pretrained
(
model, torch_dtype=torch.float16, trust_remote_code=trust_remote_code
)
if llm.config.model_type == "llama":
# To enable padding in the HF backend.
tokenizer.pad_token = tokenizer.eos_token
llm = llm.cuda
()
pbar = tqdm
(total=len
(requests
))
start = time.perf_counter
()
batch: list[str] = []
max_prompt_len = 0
max_output_len = 0
for i in range
(len
(requests
)):
prompt = requests[i].prompt
prompt_len = requests[i].prompt_len
output_len = requests[i].expected_output_len
# Add the prompt to the batch.
batch.append
(prompt
)
max_prompt_len =
max(max_prompt_len, prompt_len
)
max_output_len =
max(max_output_len, output_len
)
if len
(batch
) <
max_batch_size and i != len
(requests
) - 1:
# Check if we can add more requests to the batch.
next_prompt_len = requests[i
+ 1].prompt_len
next_output_len = requests[i
+ 1].expected_output_len
if
(
max(max_prompt_len, next_prompt_len
)
+ max(max_output_len, next_output_len
)
) <= 2048:
# We can add more requests to the batch.
continue
# Generate the sequences.
input_ids = tokenizer
(batch, return_tensors="pt", padding=True
).input_ids
llm_outputs = llm.generate
(
input_ids=input_ids.cuda
(),
do_sample=True,
num_return_sequences=n,
temperature=1.0,
top_p=1.0,
use_cache=True,
max_new_tokens=
max_output_len,
)
if not disable_detokenize:
# Include the decoding time.
tokenizer.batch_
decode(llm_outputs, skip_special_tokens=True
)
pbar.
update(len
(batch
))
# Clear the batch.
batch = []
max_prompt_len = 0
max_output_len = 0
end = time.perf_counter
()
return end - start
def run_mii
(
requests: list[SampleRequest],
model: str,
tensor_parallel_size: int,
output_len: int,
) -> float:
from mii import client, serve
llm = serve
(model, tensor_parallel=tensor_parallel_size
)
prompts = [request.prompt for request in requests]
start = time.perf_counter
()
llm.generate
(prompts,
max_new_tokens=output_len
)
end = time.perf_counter
()
client = client
(model
)
client.terminate_server
()
return end - start
def save_to_pytorch_benchmark_format
(
args: argparse.Namespace, results: dict[str, Any]
) -> None:
pt_records = convert_to_pytorch_benchmark_format
(
args=args,
metrics={
"requests_per_second": [results["requests_per_second"]],
"tokens_per_second": [results["tokens_per_second"]],
},
extra_info={
k: results[k] for k in ["elapsed_time", "num_requests", "total_num_tokens"]
},
)
if pt_records:
# Don't use json suffix here as we don't want CI to pick it up
pt_file = f"{os.path.splitext
(args.output_json
)[0]}.pytorch.json"
write_to_json
(pt_file, pt_records
)
def get_requests
(args, tokenizer
):
# Common parameters for all dataset types.
common_kwargs = {
"dataset_path": args.dataset_path,
"random_seed": args.seed,
}
sample_kwargs = {
"tokenizer": tokenizer,
"lora_path": args.lora_path,
"
max_loras": args.
max_loras,
"num_requests": args.num_prompts,
"input_len": args.input_len,
"output_len": args.output_len,
}
if args.dataset_path is None or args.dataset_name == "random":
sample_kwargs["range_ratio"] = args.random_range_ratio
sample_kwargs["prefix_len"] = args.prefix_len
dataset_cls = RandomDataset
elif args.dataset_name == "sharegpt":
dataset_cls = ShareGPTDataset
if args.backend == "vllm-chat":
sample_kwargs["enable_multimodal_chat"] = True
elif args.dataset_name == "sonnet":
assert tokenizer.chat_template or tokenizer.default_chat_template,
(
"Tokenizer/model must have chat template for sonnet dataset."
)
dataset_cls = SonnetDataset
sample_kwargs["prefix_len"] = args.prefix_len
sample_kwargs["return_prompt_formatted"] = True
elif args.dataset_name == "burstgpt":
dataset_cls = BurstGPTDataset
elif args.dataset_name == "hf":
common_kwargs["no_stream"] = args.no_stream
if args.dataset_path in VisionArenaDataset.SUPPORTED_DATASET_PATHS:
dataset_cls = VisionArenaDataset
common_kwargs["dataset_subset"] = None
common_kwargs["dataset_split"] = "train"
sample_kwargs["enable_multimodal_chat"] = True
elif args.dataset_path in InstructCoderDataset.SUPPORTED_DATASET_PATHS:
dataset_cls = InstructCoderDataset
common_kwargs["dataset_split"] = "train"
elif args.dataset_path in ConversationDataset.SUPPORTED_DATASET_PATHS:
dataset_cls = ConversationDataset
common_kwargs["dataset_subset"] = args.hf_subset
common_kwargs["dataset_split"] = args.hf_split
sample_kwargs["enable_multimodal_chat"] = True
elif args.dataset_path in AIMODataset.SUPPORTED_DATASET_PATHS:
dataset_cls = AIMODataset
common_kwargs["dataset_subset"] = None
common_kwargs["dataset_split"] = "train"
else:
raise ValueError
(f"Unknown dataset name: {args.dataset_name}"
)
# Remove None values
sample_kwargs = {k: v for k, v in sample_kwargs.items
() if v is not None}
return dataset_cls
(**common_kwargs
).sample
(**sample_kwargs
)
def main
(args: argparse.Namespace
):
if args.seed is None:
args.seed = 0
print
(args
)
random.seed
(args.seed
)
# Sample the requests.
tokenizer = AutoTokenizer.from_pretrained
(
args.tokenizer, trust_remote_code=args.trust_remote_code
)
requests = get_requests
(args, tokenizer
)
is_multi_modal = any
(request.multi_modal_data is not None for request in requests
)
request_outputs: Optional[list[RequestOutput]] = None
if args.backend == "vllm":
if args.async_engine:
elapsed_time = uvloop.run
(
run_vllm_async
(
requests,
args.n,
AsyncEngineArgs.from_cli_args
(args
),
args.disable_frontend_multiprocessing,
args.disable_detokenize,
)
)
else:
elapsed_time, request_outputs = run_vllm
(
requests,
args.n,
EngineArgs.from_cli_args
(args
),
args.disable_detokenize,
)
elif args.backend == "hf":
assert args.tensor_parallel_size == 1
elapsed_time = run_hf
(
requests,
args.model,
tokenizer,
args.n,
args.hf_
max_batch_size,
args.trust_remote_code,
args.disable_detokenize,
)
elif args.backend == "mii":
elapsed_time = run_mii
(
requests, args.model, args.tensor_parallel_size, args.output_len
)
elif args.backend == "vllm-chat":
elapsed_time, request_outputs = run_vllm_chat
(
requests, args.n, EngineArgs.from_cli_args
(args
), args.disable_detokenize
)
else:
raise ValueError
(f"Unknown backend: {args.backend}"
)
if request_outputs:
# Note: with the vllm and vllm-chat backends,
# we have request_outputs, which we use to count tokens.
total_prompt_tokens = 0
total_output_tokens = 0
for ro in request_outputs:
if not isinstance
(ro, RequestOutput
):
continue
total_prompt_tokens
+=
(
len
(ro.prompt_token_ids
) if ro.prompt_token_ids else 0
)
total_output_tokens
+= sum
(len
(o.token_ids
) for o in ro.outputs if o
)
total_num_tokens = total_prompt_tokens
+ total_output_tokens
else:
total_num_tokens = sum
(r.prompt_len
+ r.expected_output_len for r in requests
)
total_output_tokens = sum
(r.expected_output_len for r in requests
)
total_prompt_tokens = total_num_tokens - total_output_tokens
if is_multi_modal and args.backend != "vllm-chat":
print
(
"\033[91mWARNING\033[0m: Multi-modal request with "
f"{args.backend} backend detected. The "
"following metrics are not accurate because image tokens are not"
" counted. See vllm-project/vllm/issues/9778 for details."
)
# TODO
(vllm-project/vllm/issues/9778
): Count multi-modal token length.
# vllm-chat backend counts the image tokens now
print
(
f"Throughput: {len
(requests
) / elapsed_time:.2f} requests/s, "
f"{total_num_tokens / elapsed_time:.2f} total tokens/s, "
f"{total_output_tokens / elapsed_time:.2f} output tokens/s"
)
print
(f"Total num prompt tokens: {total_prompt_tokens}"
)
print
(f"Total num output tokens: {total_output_tokens}"
)
# Output JSON results if specified
if args.output_json:
results = {
"elapsed_time": elapsed_time,
"num_requests": len
(requests
),
"total_num_tokens": total_num_tokens,
"requests_per_second": len
(requests
) / elapsed_time,
"tokens_per_second": total_num_tokens / elapsed_time,
}
with open
(args.output_json, "w"
) as f:
json.dump
(results, f, indent=4
)
save_to_pytorch_benchmark_format
(args, results
)
def validate_args
(args
):
"""
Validate command-line arguments.
"""
# === Deprecation and Defaulting ===
if args.dataset is not None:
warnings.warn
(
"The '--dataset' argument will be deprecated in the next release. "
"Please use '--dataset-name' and '--dataset-path' instead.",
stacklevel=2,
)
args.dataset_path = args.dataset
if not getattr
(args, "tokenizer", None
):
args.tokenizer = args.model
# === Backend Validation ===
valid_backends = {"vllm", "hf", "mii", "vllm-chat"}
if args.backend not in valid_backends:
raise ValueError
(f"Unsupported backend: {args.backend}"
)
# === Dataset Configuration ===
if not args.dataset and not args.dataset_path:
print
("When dataset path is not set, it will default to random dataset"
)
args.dataset_name = "random"
if args.input_len is None:
raise ValueError
("input_len must be provided for a random dataset"
)
# === Dataset Name Specific Checks ===
# --hf-subset and --hf-split: only used
# when dataset_name is 'hf'
if args.dataset_name != "hf" and
(
getattr
(args, "hf_subset", None
) is not None
or getattr
(args, "hf_split", None
) is not None
):
warnings.warn
(
"--hf-subset and --hf-split will be ignored \
since --dataset-name is not 'hf'.",
stacklevel=2,
)
elif args.dataset_name == "hf":
if args.dataset_path in
(
VisionArenaDataset.SUPPORTED_DATASET_PATHS.keys
()
| ConversationDataset.SUPPORTED_DATASET_PATHS
):
assert args.backend == "vllm-chat",
(
f"{args.dataset_path} needs to use vllm-chat as the backend."
) # noqa: E501
elif args.dataset_path in
(
InstructCoderDataset.SUPPORTED_DATASET_PATHS
| AIMODataset.SUPPORTED_DATASET_PATHS
):
assert args.backend == "vllm",
(
f"{args.dataset_path} needs to use vllm as the backend."
) # noqa: E501
else:
raise ValueError
(f"{args.dataset_path} is not supported by hf dataset."
)
# --random-range-ratio: only used when dataset_name is 'random'
if args.dataset_name != "random" and args.random_range_ratio is not None:
warnings.warn
(
"--random-range-ratio will be ignored since \
--dataset-name is not 'random'.",
stacklevel=2,
)
# --prefix-len: only used when dataset_name is 'random', 'sonnet', or not
# set.
if
(
args.dataset_name not in {"random", "sonnet", None}
and args.prefix_len is not None
):
warnings.warn
(
"--prefix-len will be ignored since --dataset-name\
is not 'random', 'sonnet', or not set.",
stacklevel=2,
)
# === LoRA Settings ===
if getattr
(args, "enable_lora", False
) and args.backend != "vllm":
raise ValueError
("LoRA benchmarking is only supported for vLLM backend"
)
if getattr
(args, "enable_lora", False
) and args.lora_path is None:
raise ValueError
("LoRA path must be provided when enable_lora is True"
)
# === Backend-specific Validations ===
if args.backend == "hf" and args.hf_
max_batch_size is None:
raise ValueError
("HF
max batch size is required for HF backend"
)
if args.backend != "hf" and args.hf_
max_batch_size is not None:
raise ValueError
("HF
max batch size is only for HF backend."
)
if
(
args.backend in {"hf", "mii"}
and getattr
(args, "quantization", None
) is not None
):
raise ValueError
("Quantization is only for vLLM backend."
)
if args.backend == "mii" and args.dtype != "auto":
raise ValueError
("dtype must be auto for MII backend."
)
if args.backend == "mii" and args.n != 1:
raise ValueError
("n must be 1 for MII backend."
)
if args.backend == "mii" and args.tokenizer != args.model:
raise ValueError
("Tokenizer must be the same as the model for MII backend."
)
# --data-parallel is not supported currently.
# https://github.com/vllm-project/vllm/issues/16222
if args.data_parallel_size > 1:
raise ValueError
(
"Data parallel is not supported in offline benchmark, \
please use benchmark serving instead"
)
def create_argument_parser
():
parser = FlexibleArgumentParser
(description="Benchmark the throughput."
)
parser.add_argument
(
"--backend",
type=str,
choices=["vllm", "hf", "mii", "vllm-chat"],
default="vllm",
)
parser.add_argument
(
"--dataset-name",
type=str,
choices=["sharegpt", "random", "sonnet", "burstgpt", "hf"],
help="Name of the dataset to benchmark on.",
default="sharegpt",
)
parser.add_argument
(
"--no-stream",
action="store_true",
help="Do not load the dataset in streaming mode.",
)
parser.add_argument
(
"--dataset",
type=str,
default=None,
help="Path to the ShareGPT dataset, will be deprecated in\
the next release. The dataset is expected to "
"be a json in form of list[dict[..., conversations: "
"list[dict[..., value: <prompt_or_response>]]]]",
)
parser.add_argument
(
"--dataset-path", type=str, default=None, help="Path to the dataset"
)
parser.add_argument
(
"--input-len",
type=int,
default=None,
help="Input prompt length for each request",
)
parser.add_argument
(
"--output-len",
type=int,
default=None,
help="Output length for each request. Overrides the "
"output length from the dataset.",
)
parser.add_argument
(
"--n", type=int, default=1, help="Number of generated sequences per prompt."
)
parser.add_argument
(
"--num-prompts", type=int, default=1000, help="Number of prompts to process."
)
parser.add_argument
(
"--hf-
max-batch-size",
type=int,
default=None,
help="
Maximum batch size for HF backend.",
)
parser.add_argument
(
"--output-json",
type=str,
default=None,
help="Path to save the throughput results in JSON format.",
)
parser.add_argument
(
"--async-engine",
action="store_true",
default=False,
help="Use vLLM async engine rather than LLM class.",
)
parser.add_argument
(
"--disable-frontend-multiprocessing",
action="store_true",
default=False,
help="Disable decoupled async engine frontend.",
)
parser.add_argument
(
"--disable-detokenize",
action="store_true",
help=
(
"Do not detokenize the response
(i.e. do not include "
"detokenization time in the measurement
)"
),
)
# LoRA
parser.add_argument
(
"--lora-path",
type=str,
default=None,
help="Path to the LoRA adapters to use. This can be an absolute path, "
"a relative path, or a Hugging Face model identifier.",
)
parser.add_argument
(
"--prefix-len",
type=int,
default=None,
help=f"Number of prefix tokens to be used in RandomDataset "
"and SonnetDataset. For RandomDataset, the total input "
"length is the sum of prefix-len
(default: "
f"{RandomDataset.DEFAULT_PREFIX_LEN}
) and a random context length "
"sampled from [input_len *
(1 - range_ratio
), "
"input_len *
(1
+ range_ratio
)]. For SonnetDataset, "
f"prefix_len
(default: {SonnetDataset.DEFAULT_PREFIX_LEN}
) "
"controls how much of the input is fixed lines versus "
"random lines, but the total input length remains approximately "
"input_len tokens.",
)
# random dataset
parser.add_argument
(
"--random-range-ratio",
type=float,
default=None,
help=f"Range ratio
(default : {RandomDataset.DEFAULT_RANGE_RATIO}
) "
"for sampling input/output length, "
"used only for RandomDataset. Must be in the range [0, 1
) to "
"define a symmetric sampling range "
"[length *
(1 - range_ratio
), length *
(1
+ range_ratio
)].",
)
# hf dtaset
parser.add_argument
(
"--hf-subset", type=str, default=None, help="Subset of the HF dataset."
)
parser.add_argument
(
"--hf-split", type=str, default=None, help="Split of the HF dataset."
)
parser = AsyncEngineArgs.add_cli_args
(parser
)
return parser
if __name__ == "__main__":
parser = create_argument_parser
()
args = parser.parse_args
()
if args.tokenizer is None:
args.tokenizer = args.model
validate_args
(args
)
main
(args
)
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