Revert "remove poisson process mentions"

This reverts commit 91fc7ad.

Signed-off-by: Sophie du Couédic <[email protected]>

Author: sducouedic

vllm/benchmarks/serve.py

@@ -594,6 +594,8 @@ async def benchmark(
         if profile_output.success:
             print("Profiler started")
 
+    distribution = "Poisson process" if burstiness == 1.0 else "Gamma distribution"
+
     if ramp_up_strategy is not None:
         print(f"Traffic ramp-up strategy: {ramp_up_strategy}.")
         print(
@@ -603,7 +605,7 @@ async def benchmark(
     else:
         print(f"Traffic request rate: {request_rate}")
 
-    print(f"Burstiness factor: {burstiness}")
+    print(f"Burstiness factor: {burstiness} ({distribution})")
     print(f"Maximum request concurrency: {max_concurrency}")
 
     pbar = None if disable_tqdm else tqdm(total=len(input_requests))
@@ -1006,7 +1008,8 @@ def add_cli_args(parser: argparse.ArgumentParser):
         default=float("inf"),
         help="Number of requests per second. If this is inf, "
         "then all the requests are sent at time 0. "
-        "Otherwise, we use gamma distribution to synthesize the request arrival times.",
+        "Otherwise, we use Poisson process or gamma distribution "
+        "to synthesize the request arrival times.",
     )
     parser.add_argument(
         "--burstiness",