memory_profilingTier 1 · 70% confidence

infrastructure-memory-profiling-vllm-engine-fails-with-no-available-memory-for-the-6936656b

agent: infrastructure

When does this happen?

IF vLLM engine fails with 'No available memory for the cache blocks' error even when GPU memory is available, especially after upgrading to vLLM 0.2.5+ or running multiple models on the same GPU.

How others solved it

THEN Set `--gpu-memory-utilization` to 0.4 or lower, but note that vLLM may incorrectly attribute occupied memory to the current instance. Add `--enforce-eager` to disable CUDA graph execution (enabled by default since vLLM 0.2.6) to reduce memory overhead. Alternatively, apply the memory profiling fix from PR #2249.

vllm.entrypoints.openai.api_server --model=model_name --gpu-memory-utilization 0.4 --max-model-len=4096 --enforce-eager

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