PEEK: Predictive Queue-Informed KV Cache Management for LLM Serving
We present PEEK, a lightweight scheduling and eviction framework for both online (streaming) and offline (batch) LLM serving; this paper focuses on the online regime. PEEK maintains an incremental radix tree over the pending queue, exposing prefix-sharing clusters no existing engine surfaces. A low-overhead dual-walk matches the tree against the engine's prefix cache to yield longest-prefix-match for every waiting request; PEEK then admits cluster pioneers first so siblings inherit the freshly cached prefix, a co-designed eviction hook protects blocks ancestral to queued demand, and a multi-lane stride scheduler bounds starvation. On SGLang and vLLM across five workloads up to 4$\times$H1...
| Authors | Bing Xie, Zhipeng Wang, Masahiro Tanaka et al. |
|---|---|
| Primary category | cs.DC |
| Published | 10 May 2026 |
| Last updated at source | 12 September 2026 |
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