lm-sys / lm-sys/FastChat

Concurrent OpenAI-compatible API requests being handled sequentially

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Python
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Description

Hi, thanks for your great work.
Recently, I've run CCU load tests with my local-deployed model and found that /v1/chat/completions API being handled sequentially although I've already set --limit-worker-concurrency when starting model_worker. What do you think is the problem here? Thanks!

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  3. Fork the repository and make your change on a branch.
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Research direction

Start by tracing how model_worker handles concurrent requests to the /v1/chat/completions endpoint and how --limit-worker-concurrency is applied. Reproduce the reported behavior with a concurrent load test, then confirm that requests are no longer handled sequentially when the option is set.

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Assessment

Tech stack
python
Domain
api
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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