[Bugfix] Use a different prompt for benchmark_serving.py test prompt

Signed-off-by: Tyler Michael Smith <tyler@neuralmagic.com>

benchmarks/benchmark_serving.py

@@ -275,7 +275,7 @@ async def benchmark(
     model_id: str,
     model_name: str,
     tokenizer: PreTrainedTokenizerBase,
-    input_requests: list[SampleRequest],
+    requests: list[SampleRequest],
     logprobs: Optional[int],
     request_rate: float,
     burstiness: float,
@@ -295,12 +295,14 @@ async def benchmark(
         raise ValueError(f"Unknown backend: {backend}")
 
     print("Starting initial single prompt test run...")
+    last_idx = len(requests) - 1
     test_prompt, test_prompt_len, test_output_len, test_mm_content = (
-        input_requests[0].prompt,
-        input_requests[0].prompt_len,
-        input_requests[0].expected_output_len,
-        input_requests[0].multi_modal_data,
+        requests[last_idx].prompt,
+        requests[last_idx].prompt_len,
+        requests[last_idx].expected_output_len,
+        requests[last_idx].multi_modal_data,
     )
+    input_requests = requests[:last_idx]
 
     assert test_mm_content is None or isinstance(test_mm_content, dict)
     test_input = RequestFuncInput(
@@ -615,6 +617,9 @@ def main(args: argparse.Namespace):
         api_url = f"http://{args.host}:{args.port}{args.endpoint}"
         base_url = f"http://{args.host}:{args.port}"
 
+    # Create one more request (for a test request)
+    total_prompts = args.num_prompts + 1
+
     tokenizer = get_tokenizer(
         tokenizer_id,
         tokenizer_mode=tokenizer_mode,
@@ -632,7 +637,7 @@ def main(args: argparse.Namespace):
         # For the "sonnet" dataset, formatting depends on the backend.
         if args.backend == "openai-chat":
             input_requests = dataset.sample(
-                num_requests=args.num_prompts,
+                num_requests=total_prompts,
                 input_len=args.sonnet_input_len,
                 output_len=args.sonnet_output_len,
                 prefix_len=args.sonnet_prefix_len,
@@ -644,7 +649,7 @@ def main(args: argparse.Namespace):
                 "Tokenizer/model must have chat template for sonnet dataset."
             )
             input_requests = dataset.sample(
-                num_requests=args.num_prompts,
+                num_requests=total_prompts,
                 input_len=args.sonnet_input_len,
                 output_len=args.sonnet_output_len,
                 prefix_len=args.sonnet_prefix_len,
@@ -707,7 +712,7 @@ def main(args: argparse.Namespace):
             dataset_split=args.hf_split,
             random_seed=args.seed,
         ).sample(
-            num_requests=args.num_prompts,
+            num_requests=total_prompts,
             tokenizer=tokenizer,
             output_len=args.hf_output_len,
         )
@@ -719,15 +724,15 @@ def main(args: argparse.Namespace):
                 random_seed=args.seed, dataset_path=args.dataset_path
             ).sample(
                 tokenizer=tokenizer,
-                num_requests=args.num_prompts,
+                num_requests=total_prompts,
                 output_len=args.sharegpt_output_len,
             ),
             "burstgpt": lambda: BurstGPTDataset(
                 random_seed=args.seed, dataset_path=args.dataset_path
-            ).sample(tokenizer=tokenizer, num_requests=args.num_prompts),
+            ).sample(tokenizer=tokenizer, num_requests=total_prompts),
             "random": lambda: RandomDataset(dataset_path=args.dataset_path).sample(
                 tokenizer=tokenizer,
-                num_requests=args.num_prompts,
+                num_requests=total_prompts,
                 prefix_len=args.random_prefix_len,
                 input_len=args.random_input_len,
                 output_len=args.random_output_len,
@@ -774,7 +779,7 @@ def main(args: argparse.Namespace):
             model_id=model_id,
             model_name=model_name,
             tokenizer=tokenizer,
-            input_requests=input_requests,
+            requests=input_requests,
             logprobs=args.logprobs,
             request_rate=args.request_rate,
             burstiness=args.burstiness,