资源统计不可靠 #3

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Paul · 2024-01-30T22:28:40+08:00

Paul commented

2024-01-30 22:28:40 +08:00

目前使用 wait4 统计内存、时间开销，但如果子进程涉及多线程，统计结果将不可靠：

I don't have a reference for this, but you can easily verify it yourself. The CPU time of a grand-child is only included in the CPU time of a child if the grand-child terminated before the child and the child has waited for the termination of the grand-child with one of the wait system calls. Otherwise the CPU time of the grand child is not yet included or even completely lost.

stackexchange

这一点在 pypy3 上得到验证：A+B 问题中 RLIMIT 设置的极限内存（76MB）与统计的内存（~50MB）存在过大差距

目前使用 `wait4` 统计内存、时间开销，但如果子进程涉及多线程，统计结果将不可靠： > I don't have a reference for this, but you can easily verify it yourself. The CPU time of a grand-child is only included in the CPU time of a child if the grand-child terminated before the child and the child has waited for the termination of the grand-child with one of the wait system calls. Otherwise the CPU time of the grand child is not yet included or even completely lost. > > [stackexchange](https://unix.stackexchange.com/questions/61244/cpu-time-measurement-with-wait4-vs-cpuacct-cgroup) 这一点在 `pypy3` 上得到验证：`A+B` 问题中 `RLIMIT` 设置的极限内存（`76MB`）与统计的内存（`~50MB`）存在过大差距

Paul referenced this issue from woj/woj-server

2024-01-31 12:03:31 +08:00

使用 `cgroups` 统计资源 #9

Paul referenced this issue from woj/woj-server

2024-04-28 01:22:59 +08:00

使用 `cgroups` 统计资源 #9

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