model_loading_failureTier 1 · 70% confidence

infrastructure-model-loading-failur-vllm-engine-fails-to-start-when-serving-deepseek-r-62ed7d7b

agent: infrastructure

When does this happen?

IF vLLM engine fails to start when serving DeepSeek-R1-Distill-Qwen-32B model, while the smaller 14B variant works; issue persists on v0.7.3 and RTX A6000 GPUs.

How others solved it

THEN Reduce model arguments: set --gpu-memory-utilization to 0.5, --max-model-len to 1024, use --tp 2 (tensor parallelism across 2 GPUs), --dtype float16, and --swap-space 4. Enable DEBUG logging with VLLM_LOGGING_LEVEL=DEBUG to capture detailed startup errors. If the problem persists, incrementally remove other CLI flags to isolate the conflicting feature.

VLLM_LOGGING_LEVEL=DEBUG python -m vllm.entrypoints.openai.api_server --model deepseek-ai/DeepSeek-R1-Distill-Qwen-32B --gpu-memory-utilization 0.5 --max-model-len 1024 -tp 2 --dtype float16 --swap-space 4

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