[Minor] Fix benchmark_latency script (#2765)

benchmarks/benchmark_latency.py

@@ -37,7 +37,10 @@ def main(args: argparse.Namespace):
         max_tokens=args.output_len,
     )
     print(sampling_params)
-    dummy_prompt_token_ids = [[0] * args.input_len] * args.batch_size
+    dummy_prompt_token_ids = np.random.randint(10000,
+                                               size=(args.batch_size,
+                                                     args.input_len))
+    dummy_prompt_token_ids = dummy_prompt_token_ids.tolist()
 
     def run_to_completion(profile_dir: Optional[str] = None):
         if profile_dir:
@@ -71,7 +74,7 @@ def main(args: argparse.Namespace):
                 "."
             ) / "vllm_benchmark_result" / f"latency_result_{time.time()}"
         print(f"Profiling (results will be saved to '{profile_dir}')...")
-        run_to_completion(profile_dir=args.profile_result_dir)
+        run_to_completion(profile_dir=profile_dir)
         return
 
     # Benchmark.