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Why My Prefix Cache Missed Identical Requests

This story is from 2026-10-16. It is preserved in the archive; the latest stories are on the live feed.

I enabled prefix caching in mini-vllm-rs , my Rust LLM inference engine for macOS, and submitted two identical requests concurrently to a cold cache. Neither reused a single token. Both computed the same prompt. Why? My cache published reusable pages only when a request finished. Both requests arri…

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  1. 2026-10-16 18:44 · DEV Community — AI
    Why My Prefix Cache Missed Identical Requests

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