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Is it possible to display CPU core usage just for a single process and its child processes on Linux?

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Do you mean all processes started by some process (have the same parent PID)?

If you have pgrep you can filter all the processes with the same parent ID:

top -p $(pgrep -P 2069 -d,)

If not you can filter all process ids through awk and use them with top -p:

top -p $(ps -eo pid,ppid |awk '($2==2069){printf "%s%s",delim,$1; delim=","}')

Change $2==2069 with the actual parent pid you want to track.

  • That would show information about a single core usage, wouldn't it? – syntagma Jun 15 '15 at 17:12

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