完美回答了一个持久疑问
[Before macOS 10.10,] Activity Monitor’s “Energy Impact” was the same as top‘s
POWERmeasure [, which is a] function ofCPUandIDLEW. It’s basically the same as%CPUbut with a “tax” of 500 microseconds for each wakeup and an exception for kernel processes.
[Since macOS 10.10,] Activity Monitor consults a Mac model-specific file in the
/usr/share/pmenergy/directory[, which] includes the following factors: CPU usage, wakeup frequency, quality of service class usage, and disk, GPU, and network activity.
What does the OS X Activity Monitor’s “Energy Impact” actually measure? – Nicholas Nethercote https://blog.mozilla.org/nnethercote/2015/08/26/what-does-the-os-x-activity-monitors-energy-impact-actually-measure/comment-page-1/#comment-46775
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