distributed-inference
bojieli/ai-infra-book/skills/distributed-inference/SKILL.md
比较推理副本、prefill/decode 分离、专家放置与共享 KV 的跨实例方案。用于容量规划、路由、扩缩容和故障恢复。
Skill6.1k starsChanged 27 days ago
What's in it
- 分布式推理部署
--- name: distributed-inference description: 比较推理副本、prefill/decode 分离、专家放置与共享 KV 的跨实例方案。用于容量规划、路由、扩缩容和故障恢复。 --- # 分布式推理部署 适用:单实例配置已知,需把计算和状态分配到多个实例。依据 `manuscripts/09-分布式推理.md` 第 9.1—9.7 节。 1. 用相同任务质量、请求分布与资源总量比较完整副本、PD 分离、异构执行等候选;先列出每阶段的服务率与状态驻留量。 2. 对每次切分,计算交接的 KV 或激活字节、链路传输时间、发送端与接收端同时占用的容量,以及可能与计算重叠的部分。状态表示改变后重新计算,不能沿用旧模型的 KV 大小。 3. 路由同时考虑空闲算力和缓存亲和性。专家放置要考虑热点 skew、复制容量与最慢专家,不只看平均 token 数。 4. 在启动、扩容和故障恢复中列出模型加载、预热、状态迁移、checkpoint 或重算的时间;评估流式输出中断后的用户可见影响。 5. 用容量、吞吐、尾延迟和恢复后的按期完成率比较方案,并指出负载发生何种变化时需要重新部署。 报告资源配比、阶段服务率、链路瓶颈及状态交接成本。只有局部 kernel 指标时,先取得完整请求轨迹再做部署结论。
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