How vLLM stops one long prompt from stalling others:

(chunked prefill, clearly explained)

Every LLM request has two phases.

Prefill processes the complete input prompt in parallel. It is compute-heavy, builds the request’s KV cache, and produces the first output token.

Decode… https://t.co/zcgskLx1fD pic.twitter.com/LBEzpXP9bd

— Akshay 🚀 (@akshay_pachaar) 5 octobre 2026

How vLLM stops one long prompt from stalling others: (chunked prefill, clearly explained) Every LLM request has two phases. Prefill processes the complete input prompt in parallel. It is compute-heavy, builds the request’s KV cache, and produces the first output token. Decode

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