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Why I get non-symmetric usage of CPU on multicore PC

rated 0 times [ 5] [ 0] / answers: 1 / hits: 2380 / 1 Year ago, tue, april 11, 2023, 7:01:29

CPU: AMD Phenom II X4 955
Ubuntu 11.10 amd64

I launch some application that use only one core and when I look at cpu-load graphic in gnome-system-monitor I found that all of my four CPU's loaded not symmetrically: most of all (by time) loaded CPU2, then CPU1, then CPU3 and CPU4 was loaded for 10sec only. CPU2 was loaded at 100% for 3minutes without rest. When no application that uses a lot of CPU runing I also have CPU4 loaded lower than others. Ubuntu try to kill my PC or it's should be like this?

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allowiel

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answered 1 Year ago rhaeams · Accepted Answer

Many programs are - unfortunately - not multi-processing capable and run in a single thread/on a single processor. Some use threads, which can be executed on another processor core than the "main" program.

If you have a program that uses a single thread only, it only needs one processor and it does not make sense to move it around the other CPUs, because that takes time.

However, you can be sure that the mapping of processes to cores is fine the way it is. See http://en.wikipedia.org/wiki/Scheduling_(computing)#Linux for some information.

And no, processor cores do not overheat if only one is used over some time.