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nmon reports more than 100% for a process – clearly it is wrong?

April 26, 2017nmon process reports wrong

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nmon reports more than 100% for a process – clearly it is wrong?

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Unlike AIX commands, nmon reports the CPU use of a process per CPU. If your process is, for example, taking 250% then it is using 2.5 CPUs and must be multiple threaded. This is far better than the AIX tools because the percentages on larger machines make it very hard to determine if a process is using a whole CPU. On a 64 CPU machine a single rogue process uselessly spinning on the CPU takes up 1.56% of the total CPU – this makes it very unclear what is going on.