On Sun Jul 09 2000 at 12:53, "Malcor" wrote:
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> Does anyone know how I would go about making a script that I could run =
> as a cron job that will check the system every 5 minutes for a process =
> using over x% of the cpu or ram?
>
> It would be preferable if we could make it note the id in a file and on =
> the second check if the process were still running over X% then kill it.
>
> Thanks for any help in advance=20
>
> Scott Clifford
It is not difficult, a 5 minute job in itself.
- take the output of "ps aux | head" (or whatever)
- filter out the %CPU and %MEM fields to check for x% usage
- filter out the PID field out of the same line if > x%
- kill the process(es) if its PID has been previously saved
- save the PID if it isn't known
- remove the saved PID if the process was successfully killed
This would be very easily done with perl, but a shell script could
also do the job.
Set the cron job up in /etc/crontab for every 5 minutes.
I'd recommend against blindly killing processes like this, you never
know exactly what you'll end up killing. Kill them, if possible,
with a -TRAP (-5) before resorting to a -TERM (-15) or a -KILL (-9).
My recommendation would be to renice those processes rather than
kill them outright (although it obviously depends on why you need to
do this in the first place).
Cheers
Tony
