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Cron job and shell script to kill a process if memory gets to high

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Top Forums Shell Programming and Scripting Cron job and shell script to kill a process if memory gets to high
# 15  
Old 04-09-2012
I'm running CentOS release 5.8 (Final)

The
Code:
ps aux | grep java | sort -r -k4 | head -1 | awk '{print $4}'

command does list the amount of memory Java is using. When I run that command it's listed right now at 65.7. In true fashion, at 2:46 PM CST it's on it's way to exceeding 80% soon. I really don't think this VM has a memory issue and really believe it's the app itself.

I tried the new command
Code:
if [ `ps aux | grep java | grep -v "grep" | sort -r -k4 | head -1 | awk '{print $4}'` -gt 80 ];then
/usr/local/webhelpdesk/whd restart

and it returned:
Code:
monitor.sh: line 9: [: 66.3: integer expression expected

I think this means it's working because I've run it several times in the last 40 minutes and the number is increasing each time.

Moderator's Comments:
Mod Comment Please use code tags. Video tutorial on how to use them
Last edited by Scrutinizer; 04-09-2012 at 05:12 PM..
# 16  
Old 04-09-2012
Try:
Code:
awk '{print int($4)}'

This User Gave Thanks to Scrutinizer For This Post:
methyl
# 17  
Old 04-09-2012
That did it. So now I've got:

Code:
if [ `ps aux | grep java | sort -r -k4 | head -1 | awk '{print int($4)}'` -gt 80 ];then
  /usr/local/webhelpdesk/whd restart
fi

exit 0

Thanks!
Last edited by Scrutinizer; 04-09-2012 at 05:19 PM.. Reason: Code tags
This User Gave Thanks to prometheon123 For This Post:
methyl
# 18  
Old 04-09-2012
Quote:
sort -r -k4
Might be better as a numeric sort (though the decimal point in the sample data is likely to confuse):
Quote:
sort -n -r -k4
Other posters may wish to comment on how to sort numeric fields with a decimal point in CentOS release 5.8 (Final).
# 19  
Old 04-09-2012
Thanks none-the-less. I really appreciate everyone's help!
# 20  
Old 04-09-2012
FWIW, you could try a variation (no sort needed)

Code:
cpu_low() {
  ps aux | awk '$0~p && $4 > b {exit 1}' p="$1" b="$2"
}

if ! cpu_low java 80 ; then
  /usr/local/webhelpdesk/whd restart
fi

This User Gave Thanks to Scrutinizer For This Post:
methyl
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