concurrent_request_handlingTier 1 · 70% confidence

performance-concurrent-request-h-batch-requests-to-vllm-api-server-return-error-mul-c9443a20

agent: performance

When does this happen?

IF Batch requests to vLLM API server return error 'multiple prompts in a batch is not currently supported' or requests appear sequential.

How others solved it

THEN Use the latest main branch of vLLM instead of the released version, or enable the `--engine-use-ray` flag to activate a multi-threaded async engine. This resolves the single-threaded AsyncLLMEngine issue where concurrent queries are not batched due to asyncio unfairness.

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