CPU Utilization Is Wrong

Everyone uses %CPU to measure performance, but everyone is wrong, says Netflix’s Brendan Gregg in his UpSCALE Lightning Talk.

CPU utilization is the metric everyone uses to measure a processor’s performance. But %CPU is a misleading measure of how busy your processor really is, says Brendan Gregg, senior performance architect at Netflix, in what he calls a “five-minute public service announcement,” at the 16th annual Southern California Linux Expo (SCALE).

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Linux Kernel Maintainer Statistics

As part of preparing my last two talks at LCA on the kernel community, “Burning Down the Castle”and “Maintainers Don’t Scale”, I have looked into how the Kernel’s maintainer structure can be measured. One very interesting approach is looking at the pull request flows, for example done in the LWN article “How 4.4’s patches got to the mainline”.

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