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Htop too (lemm.ee)
submitted 7 months ago by sag@lemm.ee to c/linuxmemes@lemmy.world
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[-] bleistift2@feddit.de 113 points 7 months ago

I find this a highly interesting problem. How do you measure how much CPU time a program needs? The OS has ceded its control of the CPU to the program. Does it just look at the clock after it’s in charge again to derive a program’s load?

While we’re at it: How does the OS even yank the CPU away from the currently running process?

[-] AE5NE@lemmy.radio 17 points 7 months ago* (last edited 7 months ago)

yes, it looks at a fine-grained clock, usually a cycle counter provided by the CPU for this purpose, to aggregate total on-cpu time for each process.

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this post was submitted on 16 Feb 2024
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