vllm - 💡(How to fix) Fix [Bug]: Mismatch between batch queue size and max-num-seqs [1 participants]

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vllm-project/vllm#39981Fetched 2026-04-17 08:27:58
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Your current environment

Phython3.12.12, vllm=0.11.2, model- GPT-OSS-120b

🐛 Describe the bug

I think batch Queue size and max-num-sequences should have same value based on documentation below. But please find the vllm logs attached along with official vllm definition

OFFICIAL DOCUMENTATION

<img width="611" height="87" alt="Image" src="https://github.com/user-attachments/assets/ccabcb6f-41b8-4e90-8f98-a5ed96248da3" /> <img width="621" height="184" alt="Image" src="https://github.com/user-attachments/assets/7936aac7-b143-4e21-9d3a-eb64ae1d288b" />

ACTUAL LOGS:-

<img width="841" height="187" alt="Image" src="https://github.com/user-attachments/assets/0be5b8ef-e629-4e14-946a-61e6cd2662ce" /> <img width="940" height="134" alt="Image" src="https://github.com/user-attachments/assets/cba2e609-0510-4751-8ee5-37b2e1770f5c" /> <img width="937" height="392" alt="Image" src="https://github.com/user-attachments/assets/2360e312-6de5-4888-8844-7c65af522739" />

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extent analysis

TL;DR

Set the batch queue size and max-num-sequences to the same value as recommended by the official documentation to potentially resolve the issue.

Guidance

  • Review the official documentation images provided to understand the recommended configuration for batch queue size and max-num-sequences.
  • Compare the current configuration with the recommended settings and adjust them accordingly.
  • Verify that the issue persists after updating the configuration to ensure the fix is effective.
  • If the issue remains, consider seeking further assistance from the vllm community or support channels.

Notes

The provided images and documentation suggest a specific configuration, but without direct access to the images, it's challenging to provide a precise fix. The guidance is based on the assumption that the images contain relevant configuration recommendations.

Recommendation

Apply workaround: Update the batch queue size and max-num-sequences to match the recommended values, as this is the most direct action implied by the provided documentation and issue description.

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