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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

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huangmingyou opened this issue Jan 11, 2023 · 5 comments
Open

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

huangmingyou opened this issue Jan 11, 2023 · 5 comments
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@huangmingyou
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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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@huangmingyou huangmingyou added help wanted Extra attention is needed question Further information is requested labels Jan 11, 2023
@panjf2000
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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
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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
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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
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通过cgroup方式绑定到了两颗cpu , 对，把multicore=false,性能更好。

@panjf2000
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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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@huangmingyou @panjf2000