用taskset把程序绑定到多核心以后，性能不如taskset绑定到单核心

panjf2000 / gnet

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用taskset把程序绑定到多核心以后，性能不如taskset绑定到单核心 #433

Closed huangmingyou closed 1 month ago

huangmingyou commented 1 year ago

Questions with details

本来的计划是在机器上隔离出单独的cpu给应用使用。但是用taskset绑定多核心以后，性能反而不如在单核心上面好。multicore 这个参数有什么设置技巧吗?

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panjf2000 commented 1 year ago

你的业务场景是不是单核心就足够了，设置多核心反而因为上下文切换而降低了性能？

huangmingyou commented 1 year ago

单核心不太够用，还是希望能多核心运行。同样的配置，如果不使用 cpuset或者taskset做cpu绑定，性能会比作了cpu绑定好。是否是cpu绑定会影响到gnet的性能。

panjf2000 commented 1 year ago

你绑了多少个 CPU 到进程上？

然后你说不设置 option.multicore 和 option.NumEventLoop 性能更好？

huangmingyou commented 1 year ago

通过cgroup方式绑定到了两颗cpu , 对，把multicore=false,性能更好。

panjf2000 commented 1 year ago

你能提供一下复现步骤吗？最好是有 demo 代码可以测试。

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