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#caching

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papersTODAY 04:00 UTC

arXiv Study Tests Shared KV Cache Across Two 27B vLLM Replicas

Researchers examined what happens when two single-GPU 27B vLLM inference replicas share a 256 GiB host-memory cache pool (LMCache), aiming to skip repeated prefill work as requests move between replicas. The paper reports both correctness problems in transferring cached state and performance limits tied to lost prefix locality. The authors argue that shared caching only pays off when state handoff is reliable and locality loss stays small.

inference/caching/vllm/benchmarks