Meta open-sources Suffix Cache Reuse: a SGLang patch to cut re-prefill on context edits
RulinShao · x · 2026-10-02
Meta researchers (Rulin Shao et al.) released a SGLang patch implementing Suffix Cache Reuse (SCR) for efficient serving of context language models. Because CLMs edit their own context mid-prompt, standard prefix-cache reuse must re-prefill everything after the first mismatch. SCR instead reuses cached states of all surviving tokens — including the suffix C, whose stale states can even retain richer past information — and only re-prefills newly inserted or appended spans. The repo also provides a cache-hit-rate decomposition across CLM context editing and reasoning-token stripping, and quantifies remaining headroom, arguing cache space is a promising direction.
Related event: Meta Open-Sources Suffix Cache Reuse for Hybrid Attention Models(2 posts)→
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