3956a30b14
Allow switching between vLLM V1/V2 engines via command line flag. Default behavior now uses V2 (VLLM_USE_V1=0). Generated with [Claude Code](https://claude.ai/code) via [Happy](https://happy.engineering) Co-Authored-By: Claude <noreply@anthropic.com> Co-Authored-By: Happy <yesreply@happy.engineering>
107 lines
4.1 KiB
Python
107 lines
4.1 KiB
Python
import os
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import sys
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# Parse --use-v1 flag before importing vllm
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use_v1 = "--use-v1" in sys.argv
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if use_v1:
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os.environ["VLLM_USE_V1"] = "1"
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sys.argv.remove("--use-v1")
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else:
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os.environ["VLLM_USE_V1"] = "0"
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import time
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from random import randint, seed
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from vllm import LLM, SamplingParams
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def bench_decode(llm, num_seqs, input_len, output_len):
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"""Benchmark decode performance"""
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seed(0)
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prompt_token_ids = [[randint(0, 10000) for _ in range(input_len)] for _ in range(num_seqs)]
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sampling_params = SamplingParams(temperature=0.6, ignore_eos=True, max_tokens=output_len)
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prompt_token_ids = [dict(prompt_token_ids=p) for p in prompt_token_ids]
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t = time.time()
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llm.generate(prompt_token_ids, sampling_params, use_tqdm=False)
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t = time.time() - t
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# Calculate metrics
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prefill_tokens = num_seqs * input_len
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decode_tokens = num_seqs * output_len
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decode_throughput = decode_tokens / t
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print(f"[Decode] Input: {num_seqs}x{input_len}tok, Output: {decode_tokens}tok, Time: {t:.2f}s")
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print(f" Throughput: {decode_throughput:.2f} tok/s (includes prefill overhead)")
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def bench_prefill(llm, num_seqs, input_len):
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"""Benchmark prefill performance"""
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seed(0)
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# Fixed length input, minimal output to focus on prefill
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prompt_token_ids = [[randint(0, 10000) for _ in range(input_len)] for _ in range(num_seqs)]
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sampling_params = SamplingParams(temperature=0.6, ignore_eos=True, max_tokens=1)
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prompt_token_ids = [dict(prompt_token_ids=p) for p in prompt_token_ids]
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t = time.time()
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llm.generate(prompt_token_ids, sampling_params, use_tqdm=False)
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t = time.time() - t
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total_input_tokens = num_seqs * input_len
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throughput = total_input_tokens / t
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print(f"[Prefill] Input: {total_input_tokens}tok ({num_seqs}x{input_len}), Time: {t:.2f}s, Throughput: {throughput:.2f}tok/s")
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def main():
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import argparse
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parser = argparse.ArgumentParser(description="Benchmark vLLM performance (for comparison)")
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parser.add_argument("--model", type=str, default="~/models/Llama-3.1-8B-Instruct",
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help="Model path (default: ~/models/Llama-3.1-8B-Instruct)")
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parser.add_argument("--input-len", type=int, default=None, help="Input length in tokens")
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parser.add_argument("--output-len", type=int, default=64, help="Output length for decode benchmark (default: 64)")
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parser.add_argument("--max-len", type=int, default=32*1024, help="Max model length (default: 32K)")
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parser.add_argument("--gpu-util", type=float, default=0.9, help="GPU memory utilization (default: 0.9)")
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parser.add_argument("--enforce-eager", action="store_true", help="Disable CUDA Graphs (use eager mode)")
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parser.add_argument("--bench-decode", action="store_true", help="Run decode benchmark (default: prefill only)")
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parser.add_argument("--bench-all", action="store_true", help="Run both prefill and decode benchmarks")
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args = parser.parse_args()
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path = os.path.expanduser(args.model)
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max_len = args.max_len
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print(f"\n[vLLM] max_len={max_len}, gpu_util={args.gpu_util}, enforce_eager={args.enforce_eager}")
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llm = LLM(
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path,
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enforce_eager=args.enforce_eager,
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max_model_len=max_len,
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max_num_seqs=128,
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gpu_memory_utilization=args.gpu_util,
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)
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# Warmup
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print("\nWarming up...")
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llm.generate([dict(prompt_token_ids=[0, 1, 2])], SamplingParams(max_tokens=10))
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# Default input lengths
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prefill_input_len = args.input_len if args.input_len else max_len - 1
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decode_input_len = args.input_len if args.input_len else max_len - args.output_len
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# Determine which benchmarks to run
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run_prefill = not args.bench_decode or args.bench_all
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run_decode = args.bench_decode or args.bench_all
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if run_prefill:
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print("\n" + "=" * 60)
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print("Prefill Benchmark (vLLM)")
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print("=" * 60)
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bench_prefill(llm, num_seqs=1, input_len=prefill_input_len)
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if run_decode:
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print("\n" + "=" * 60)
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print("Decode Benchmark (vLLM)")
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print("=" * 60)
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bench_decode(llm, num_seqs=1, input_len=decode_input_len, output_len=args.output_len)
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if __name__ == "__main__":
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main()
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