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Lsm mul thread #228

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@gxglls gxglls commented Jan 23, 2024

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smilecuty
smilecuty reviewed Jan 23, 2024
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docs/deploy-iomesh-cluster/performance-tips.md
在 chunk 内部，处理磁盘 IO 的组件为 LSM(Local Storage Manager)。 默认情况下，LSM 是以单线程的形态运行，当用户对 IO 延迟和性能上限有更高的要求，并且 k8s worker 节点上有足够的 cpu 资源时，可以考虑开启 LSM 多线程

## 配置 LSM 多线程
在 IOMesh Helm Values 文件中, 配置 `iomesh.chunk.extraEnvs` 字段
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导出后的默认值是啥

docs/deploy-iomesh-cluster/performance-tips.md
chunk:
extraEnvs:
LSM_IO_THREAD_NUM: "2" # 配置 LSM 使用的独立线程数量，取值范围为 0-2，如果为 0 则代表不开启 LSM 多线程
```
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是不是要告诉用户一下怎么看生效了

docs/deploy-iomesh-cluster/performance-tips.md

对于已部署的 IOMesh 集群，修改完毕后可以使用 helm upgrade 对集群进行配置更新，chunk pod 会逐个重启并生效配置。

# cpu 核心绑定与独占
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开启LSM后，对于2种绑核方式，最后的验证，需要再增加什么吗？

smilecuty
smilecuty reviewed Jan 23, 2024
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docs/deploy-iomesh-cluster/performance-tips.md

# 为 chunk 配置更多 cpu 核心

在 chunk 内部，处理磁盘 IO 的组件为 LSM(Local Storage Manager)。 默认情况下，LSM 是以单线程的形态运行，当用户对 IO 延迟和性能上限有更高的要求，并且 k8s worker 节点上有足够的 cpu 资源时，可以考虑开启 LSM 多线程
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强调与绑核功能一起配置

smilecuty
smilecuty reviewed Jan 24, 2024
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docs/deploy-iomesh-cluster/performance-tips.md Outdated
如果 chunk 开启了 lsm 多线程，通过如下命令验证 lsm 是否使用了独立的 cgroup 配置和核心
```shell
# cat /sys/fs/cgroup/cpuset/zbs/lsm-io/cpuset.cpus
2
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需要显示2个值

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@gxglls @smilecuty