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[V1][Metrics] Add per-request TPOT histogram #24015

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Merged
mgoin merged 2 commits into from
Sep 24, 2025
Merged

[V1][Metrics] Add per-request TPOT histogram #24015

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5bf87c0
metrics add tpot
baxingpiaochong Sep 3, 2025
1180619
Merge branch 'main' into add_tpot_compute_per_request
baxingpiaochong Sep 11, 2025
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15 changes: 15 additions & 0 deletions vllm/v1/metrics/loggers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -403,6 +403,19 @@ def __init__(self,
self.histogram_inter_token_latency = make_per_engine(
histogram_inter_token_latency, engine_indexes, model_name)

histogram_request_time_per_output_token = self._histogram_cls(
name="vllm:request_time_per_output_token_seconds",
documentation=
"Histogram of time_per_output_token_seconds per request.",
buckets=[
0.01, 0.025, 0.05, 0.075, 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, 0.75,
1.0, 2.5, 5.0, 7.5, 10.0, 20.0, 40.0, 80.0
],
labelnames=labelnames)
self.histogram_request_time_per_output_token = make_per_engine(
histogram_request_time_per_output_token, engine_indexes,
model_name)

request_latency_buckets = [
0.3, 0.5, 0.8, 1.0, 1.5, 2.0, 2.5, 5.0, 10.0, 15.0, 20.0, 30.0,
40.0, 50.0, 60.0, 120.0, 240.0, 480.0, 960.0, 1920.0, 7680.0
Expand Down Expand Up @@ -573,6 +586,8 @@ def record(self,
finished_request.num_prompt_tokens)
self.histogram_num_generation_tokens_request[engine_idx].observe(
finished_request.num_generation_tokens)
self.histogram_request_time_per_output_token[engine_idx].observe(
finished_request.mean_time_per_output_token)
if finished_request.max_tokens_param:
self.histogram_max_tokens_request[engine_idx].observe(
finished_request.max_tokens_param)
Expand Down
10 changes: 9 additions & 1 deletion vllm/v1/metrics/stats.py
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,7 @@ class FinishedRequestStats:
prefill_time: float = 0.0
inference_time: float = 0.0
decode_time: float = 0.0
mean_time_per_output_token: float = 0.0


class IterationStats:
Expand Down Expand Up @@ -172,6 +173,12 @@ def update_from_finished_request(self, finish_reason: "FinishReason",
# Any preemptions during prefill or decode are included
inference_time = req_stats.last_token_ts - req_stats.scheduled_ts

# Do not count the token generated by the prefill phase
mean_time_per_output_token = (decode_time /
(req_stats.num_generation_tokens - 1)
if req_stats.num_generation_tokens -
1 > 0 else 0)

finished_req = \
FinishedRequestStats(finish_reason=finish_reason,
e2e_latency=e2e_latency,
Expand All @@ -181,7 +188,8 @@ def update_from_finished_request(self, finish_reason: "FinishReason",
queued_time=queued_time,
prefill_time=prefill_time,
inference_time=inference_time,
decode_time=decode_time)
decode_time=decode_time,
mean_time_per_output_token=mean_time_per_output_token)
self.finished_requests.append(finished_req)


Expand Down