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[Metrics] Log number of preempted requests (#28522)

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Add tracking and periodic logging for the number of preempted requests in the
metrics logger. This helps monitor system behavior under load.

Signed-off-by: Yining Liu <610lyn@gmail.com>
This commit is contained in:
lyn610 2025-11-14 17:47:45 +08:00 committed by GitHub
parent 8cfbe89b93
commit ecf8230d4d
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GPG Key ID: B5690EEEBB952194
1 changed files with 19 additions and 4 deletions
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23
vllm/v1/metrics/loggers.py
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@ -118,12 +118,14 @@ class LoggingStatLogger(StatLoggerBase):
self.num_prompt_tokens: int = 0
self.num_generation_tokens: int = 0
self.num_corrupted_reqs: int = 0
self.num_preemptions: int = 0
def _track_iteration_stats(self, iteration_stats: IterationStats):
# Save tracked stats for token counters.
self.num_prompt_tokens += iteration_stats.num_prompt_tokens
self.num_generation_tokens += iteration_stats.num_generation_tokens
self.num_corrupted_reqs += iteration_stats.num_corrupted_reqs
self.num_preemptions += iteration_stats.num_preempted_reqs
def _get_throughput(self, tracked_stats: int, now: float) -> float:
# Compute summary metrics for tracked stats
@ -196,18 +198,31 @@ class LoggingStatLogger(StatLoggerBase):
"Avg generation throughput: %.1f tokens/s",
"Running: %d reqs",
"Waiting: %d reqs",
"GPU KV cache usage: %.1f%%",
"Prefix cache hit rate: %.1f%%",
]
log_args = [
self.last_prompt_throughput,
self.last_generation_throughput,
self.last_scheduler_stats.num_running_reqs,
self.last_scheduler_stats.num_waiting_reqs,
self.last_scheduler_stats.kv_cache_usage * 100,
self.prefix_caching_metrics.hit_rate * 100,
]
if self.num_preemptions > 0:
log_parts.append("Preemptions: %d")
log_args.append(self.num_preemptions)
log_parts.extend(
[
"GPU KV cache usage: %.1f%%",
"Prefix cache hit rate: %.1f%%",
]
)
log_args.extend(
[
self.last_scheduler_stats.kv_cache_usage * 100,
self.prefix_caching_metrics.hit_rate * 100,
]
)
if envs.VLLM_COMPUTE_NANS_IN_LOGITS:
log_parts.append("Corrupted: %d reqs")
log_args.append(self.num_corrupted_reqs)