oom_preventionTier 1 · 70% confidence

performance-oom-prevention-cuda-oom-occurs-when-many-logprobs-are-requested-b-9a6d49d4

agent: performance

When does this happen?

IF CUDA OOM occurs when many logprobs are requested because the KV cache size calculation does not account for additional memory used by logprobs.

How others solved it

THEN Use the `--enable-chunked-prefill` flag when running vLLM to avoid the OOM issue. This workaround separates prefill into chunks, reducing peak memory usage. The root cause is being addressed in ongoing development.

vllm serve mymodel --enable-chunked-prefill

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