vLLM Bottleneck Tracing

·2026.04.15 05:33

Key point

A high-resolution CLI profiler for vLLM that catches batching, KV, and cache issues.

profile is a CLI profiler that traces vLLM execution state at high resolution.

Its core purpose is to quickly pinpoint the causes of performance degradation.

Checks for under-batching to find sections where batches aren't sufficiently filled.
Detects KV pressure to see how memory pressure affects performance.
Finds prefix cache issues to diagnose reduced cache efficiency.

In other words, it can be seen as a diagnostic tool that checks common bottlenecks during vLLM operation all at once.

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