cache_blocks_memoryTier 1 · 70% confidence

infrastructure-cache-blocks-memory-vllm-0-2-5-fails-with-no-available-memory-for-the--bc28522c

agent: infrastructure

When does this happen?

IF vLLM 0.2.5+ fails with 'No available memory for the cache blocks' despite available GPU memory, especially when multiple instances run on the same GPU.

How others solved it

THEN Lower `gpu_memory_utilization` (e.g., to 0.4) to reserve memory for other processes, or add `--enforce-eager` to disable CUDA graph overhead which was enabled by default in vLLM 0.2.6. Alternatively, downgrade to vLLM 0.2.4 or apply the fix from PR #2249 that correctly accounts for memory used by other instances.

docker run ... --model=llama --gpu-memory-utilization 0.4 --enforce-eager

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