issue/239 bench vllm script

test/bench/bench_vllm.py

+import argparse
+import itertools
+import time
+import random
+
+import torch
+import json
+
+
+from vllm.engine.llm_engine import LLMEngine
+from vllm.engine.arg_utils import EngineArgs
+from vllm.inputs import TokensPrompt
+from vllm.sampling_params import SamplingParams
+
+# import os
+# import logging
+# os.environ["VLLM_LOGGING_LEVEL"] = "ERROR"
+# logging.getLogger("vllm").setLevel(logging.ERROR)
+
+
+def parse_list(value: str):
+    """Parse parse_list argument: can be a single int or a list of ints.
+
+    Examples:
+        "1" -> 1
+        "[1,2,4]" -> [1, 2, 4]
+        "1,2,4" -> [1, 2, 4]
+    """
+    value = value.strip()
+    # Try to parse as JSON list first
+    if value.startswith("[") and value.endswith("]"):
+        try:
+            result = json.loads(value)
+            if isinstance(result, list):
+                return [int(x) for x in result]
+            return int(result)
+        except (json.JSONDecodeError, ValueError):
+            pass
+
+    # Try to parse as comma-separated values
+    if "," in value:
+        try:
+            return [int(x.strip()) for x in value.split(",")]
+        except ValueError:
+            pass
+
+    # Try to parse as a single integer
+    try:
+        return [int(value)]
+    except ValueError:
+        raise argparse.ArgumentTypeError(
+            f"batch-size must be an int or list[int], got: {value}"
+        )
+
+
+def run_one_case(
+    engine: LLMEngine,
+    batch_size: int,
+    input_len: int,
+    output_len: int,
+    vocab_size: int,
+):
+    # ------------------------------------------------------------
+    # 1. Random input token IDs
+    # ------------------------------------------------------------
+    input_ids_list = [
+        [random.randint(0, vocab_size - 1) for _ in range(input_len)]
+        for _ in range(batch_size)
+    ]
+
+    sampling_params = SamplingParams(
+        max_tokens=output_len,
+        ignore_eos=True,
+        temperature=1.0,
+        top_p=0.9,
+        top_k=50,
+    )
+
+    request_ids = []
+    for i, input_ids in enumerate(input_ids_list):
+        rid = f"req_{i}"
+        engine.add_request(
+            request_id=rid,
+            prompt=TokensPrompt(prompt_token_ids=input_ids),
+            params=sampling_params,
+        )
+        request_ids.append(rid)
+
+    # ------------------------------------------------------------
+    # 2. Run until first decode token appears (prefill timing)
+    # ------------------------------------------------------------
+    t0 = time.perf_counter()
+    first_token_seen = False
+
+    while not first_token_seen:
+        outputs = engine.step()
+        for out in outputs:
+            if out.outputs and len(out.outputs[0].token_ids) > 0:
+                first_token_seen = True
+    torch.cuda.synchronize()
+    t1 = time.perf_counter()
+
+    prefill_time = t1 - t0
+    prefill_tokens = batch_size * input_len
+
+    # ------------------------------------------------------------
+    # 3. Decode until all requests finish
+    # ------------------------------------------------------------
+    decode_start = time.perf_counter()
+
+    while engine.has_unfinished_requests():
+        outputs = engine.step()
+
+    torch.cuda.synchronize()
+    decode_end = time.perf_counter()
+
+    decode_time = decode_end - decode_start
+    decode_tokens = batch_size * (output_len - 1)
+
+    return {
+        "batch_size": batch_size,
+        "input_len": input_len,
+        "output_len": output_len,
+        "prefill_tput": prefill_tokens / prefill_time,
+        "decode_tput": decode_tokens / decode_time,
+    }
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--model", type=str, required=True)
+    parser.add_argument(
+        "--batch-size",
+        type=parse_list,
+        default=[1],
+        help=(
+            "number of prompts in a batch (int or list, e.g. '1', '1,2,4', '[1,2,4]')"
+        ),
+    )
+    parser.add_argument(
+        "--input-len",
+        type=parse_list,
+        default=[256],
+        help="input sequence length(s)",
+    )
+    parser.add_argument(
+        "--output-len",
+        type=parse_list,
+        default=[256],
+        help="output sequence length(s)",
+    )
+    parser.add_argument(
+        "--tensor-parallel-size",
+        "--tp",
+        type=int,
+        default=1,
+        help="total rank for tensor parallel",
+    )
+    parser.add_argument("--dtype", type=str, default="auto")
+    parser.add_argument("--num-iters-warmup", type=int, default=2)
+    args = parser.parse_args()
+
+    # ------------------------------------------------------------
+    # Engine init (TP supported here)
+    # ------------------------------------------------------------
+    engine_args = EngineArgs(
+        model=args.model,
+        dtype=args.dtype,
+        tensor_parallel_size=args.tensor_parallel_size,
+        trust_remote_code=True,
+        distributed_executor_backend="mp",
+        enable_chunked_prefill=False,
+    )
+
+    engine = LLMEngine.from_engine_args(engine_args)
+    vocab_size = engine.model_config.get_vocab_size()
+
+    # ------------------------------------------------------------
+    # Sweep all combinations
+    # ------------------------------------------------------------
+    print("\n=== Running benchmark ===")
+    results = []
+
+    try:
+        for bs, il, ol in itertools.product(
+            args.batch_size, args.input_len, args.output_len
+        ):
+            # Warmup
+            for _ in range(args.num_iters_warmup):
+                run_one_case(
+                    engine,
+                    batch_size=bs,
+                    input_len=il,
+                    output_len=ol,
+                    vocab_size=vocab_size,
+                )
+
+            res = run_one_case(
+                engine,
+                batch_size=bs,
+                input_len=il,
+                output_len=ol,
+                vocab_size=vocab_size,
+            )
+            results.append(res)
+
+            print(
+                f"[TP={args.tensor_parallel_size} | "
+                f"bs={bs} in={il} out={ol}] "
+                f"prefill={res['prefill_tput']} tok/s | "
+                f"decode={res['decode_tput']} tok/s"
+            )
+    except Exception as e:
+        print(f"Error Occured: {e}")
+    # ------------------------------------------------------------
+    # Summary
+    # ------------------------------------------------------------
+    print("\n=== Summary ===")
+    print("bs   in_len   out_len   prefill_tok/s     decode_tok/s")
+    for r in results:
+        print(
+            f"{r['batch_size']:3d}  "
+            f"{r['input_len']:7d}  "
+            f"{r['output_len']:8d}  "
+            f"{r['prefill_tput']:14.2f}  "
+            f"{r['decode_tput']:14.2f}"
+        )
+
+
+if __name__ == "__main__":
+    torch.manual_seed(0)
+    random.seed(0)
+    main()