Show CPU core usage for parent process and its child processes

Question

First of all, let me ask this:

Let's say that a web application has its timeout set to 10 minutes. For some reason, the user is idle. If he/she returns and press any key or moves the mouse, it resets the timeout? Or it is based on the last time it went to the server?

And now the second question: is there a way to find the time until the user gets logged off due to innactivity?

Solution

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.

Comments

[syntagma]

That would show information about a single core usage, wouldn't it?