Keeping vLLM's prefix cache warm between agent turns: an engineering guide
bolts98 · reddit · 2026-09-17
An engineering post explains how to keep vLLM's prefix cache warm across agent turns so KV computation isn't redone each time. It covers why cache hits are commonly lost (requests routed to different workers, reordered context) and concrete fixes: keeping prefixes stable, session affinity, and cache warming—cutting latency and compute for multi-turn agent workloads.
Related event: Keeping vLLM Prefix Cache Hot Across Multi-Turn Agent Conversations(2 posts)→
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