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CPU Time vs Usage (ani.social)

submitted 3 days ago by [email protected] to c/[email protected]

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I'm self studying for a server+ cert and ran into this paragraph. Am I right that CPU time is a set of ticks utilized, the CPU Capacity is the total capacity, and the CPU usage is the percentage of ticks:capacity?

I have been making notes from this chapter, and the more I get into it the more I seem to find things like this that seem slightly off.

Does anyone have a physical copy of the 2ed McMillan CompTia Server+ study guide I can compare against? I feel like someone is messing with me.

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[–] [email protected] 2 points 3 days ago (1 children)

You are correct. Here’s a thread on how CPU usage is calculated:

https://stackoverflow.com/questions/3748136/how-is-cpu-usage-calculated

It’s basically (CPU time of the process) / (clock time), or (CPU time)/(clock time * number of hardware threads), depending on how it’s reported.

Note that there’s are some complications here, like the time “wasted” context switching or running the OS.

[–] [email protected] 1 points 3 days ago

Thanks, good thread. I'm not sure if that's one I referenced to confirm what I suspected, but it is very clear.