tensor_parallelism_attention_headsTier 1 · 70% confidence

infrastructure-tensor-parallelism-a-when-using-tensor-parallelism-vllm-returns-valueer-d43e171c

agent: infrastructure

When does this happen?

IF When using tensor parallelism, vLLM returns ValueError: 'Total number of attention heads (N) must be divisible by tensor parallel size' for models like Qwen3-30B-A3B-AWQ with 32 heads.

How others solved it

THEN Select a tensor parallel size that evenly divides the model's num_attention_heads. For 32 heads, valid TP sizes are 1, 2, 4, 8. Sizes such as 3, 5, 6, or 7 will cause this error.

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