oom_preventionTier 1 · 70% confidence

performance-oom-prevention-cuda-out-of-memory-oom-occurs-when-requesting-many-dae74739

agent: performance

When does this happen?

IF CUDA Out-of-Memory (OOM) occurs when requesting many logprobs because activation memory from logprob computation is not accounted for during KV cache sizing.

How others solved it

THEN Enable chunked prefill by passing the `--enable-chunked-prefill` flag to vLLM. This spreads memory usage across multiple steps and prevents the OOM caused by logprob overhead.

python -m vllm.entrypoints.api_server --model <your_model> --enable-chunked-prefill

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