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How do I find username that in total (i.e sum for all processes) uses the most CPU time?

Also I want to find the total amount of memory consumed by running processes of that user and output processes of that user which use > 50 percent of CPU time.

I don't really know how to parse ps in order to be able to maintain the sum for each user.

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  • If you're on Linux w/ systemd, and have DefaultCPUAccounting=yes in /etc/systemd/system.conf, then systemd-cgtop should do it. Quite a lot of assumptions, so not really an answer...
    – derobert
    Commented Jun 4, 2017 at 0:19

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If you're after realtime results, without the need to parse ps, use top.

top

then press

u

type in the username of the person you want to search, then press enter.

Pressing > will sort based on a specific column, (in this case you want to keep pressing > until you are sorting by %CPU) TIME+ is actual CPU time, not the duration the process has been running. (A common misconception).

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