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English(EN) vLLM prefix caching on vs off: 7.5x the throughput with a 4,000-token system prompt on one L40S

vLLM 前缀缓存将 LLM 吞吐量提升 7.5 倍,大幅降低延迟

最近在单个 L40S GPU 上进行的基准测试表明,vLLM 的前缀缓存功能可以显著提高 LLM 推理的吞吐量并降低延迟。当使用 4000 个 token 的系统提示符和 64 个并发用户进行测试时,启用前缀缓存可将输出吞吐量提高约 7.5 倍,并将 p99 首个 token 的时间从 23.9 秒缩短到 0.38 秒。基准测试还显示,前缀缓存最大限度地减少了较长系统提示符对性能的影响,在不同提示符长度下吞吐量几乎保持不变。 AI

影响 展示了 LLM 推理方面显著的性能提升,有可能降低运营成本并改善用户体验。

排序理由 详细说明 LLM 服务框架性能改进的基准测试结果。[lever_c_demoted from research: ic=1 ai=1.0]

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vLLM 前缀缓存将 LLM 吞吐量提升 7.5 倍,大幅降低延迟

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详细说明 LLM 服务框架性能改进的基准测试结果。[lever_c_demoted from research: ic=1 ai=1.0]
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  1. dev.to — LLM tag TIER_1 English(EN) · Runcrate ·

    vLLM 前缀缓存开启与关闭:在 L40S 上使用 4000 个 token 的系统提示符可实现 7.5 倍吞吐量

    <p>Most chat traffic sends the same system prompt in front of every request. vLLM can keep the KV cache for that shared prefix and skip recomputing it (automatic prefix caching, on by default since the V1 engine). I wanted to know what that is worth in numbers, so I rented one L4…