How Long Prompts Block Other Requests - Optimizing LLM Performance

The article discusses optimization of LLM performance, specifically how long prompts block other requests, and describes a vLLM update that implements parallel prefills with a limit on long prompt requests to reduce time-to-first-token for short prompts.

From the source
In one of the latest vLLM updates, an improved strategy has been implemented: it allows for parallel prefills of different requests but with a limit to the number of concurrently processed long prompt requests.
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Announced: 12 Jun 2025 08:00 UTC
Detected: 03 Aug 2026 21:12 UTC (+417d after)

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