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PID autokill

Posted on 2011-03-22
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Last Modified: 2012-05-11
Hello,

Could somebody help with writing a cron script, that will check all running processes and kill those ones, which cpu usage is above 90% for example?

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Question by:tanel
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Expert Comment

by:crazyn3wf
ID: 35190208
Try this
#!/bin/bash
#
# Process control
#
# This shell-script watch that <process> doesn't pass the <limit> of % cpu usage
# If it does, the script kills that process and finish
#
# For linux kernel 2.6.x
# v.0.1 sept-2007
#
# Author: Miguel Ángel Molina Molina
# Licence: GPL v.2

# Parameter check
# [debug] parameter is optional and can be anything. If it exists, the script produces output to the screen for debugging purposes.
if [ $# -lt 2 -o $# -gt 3 ];
then
  echo "Usage: `basename $0` <process> <limit> [debug]"
  exit -1
fi

# [debug] exists?
if [ $# -eq 3 ];
then
  debug="yes"
else
  debug=""
fi

procpid=`pidof $1`
typeset -i limit=$2

# process existence check
if [ -z "$procpid" ];
then
  echo "Process: $1 doesn't exists"
  exit -1
fi

# limit check
if [ $limit -lt 1 -o $limit -gt 99 ];
then
  echo "Limit must be between 1 and 99"
  exit -1
fi

typeset -i hits=0

while [ 1 ]
do
  # Get usage cpu time
  typeset -i cputime=`cat /proc/uptime | cut -f1 -d " " | sed 's/\.//'`
  # process pid check

  if [ ! -f /proc/${procpid}/stat ];
  then
    echo "Process doesn't exists: ${procpid}"
    exit -1
  fi
  # Get process usage cpu time
  typeset -i proctime=`cat /proc/${procpid}/stat | awk '{t = $14 + $15;print t}'`
  # wait 5 seconds
  sleep 5
  # get usage cpu time, again
  typeset -i cputime2=`cat /proc/uptime | cut -f1 -d " " | sed 's/\.//'`
  # get process usage cpu time, again
  typeset -i proctime2=`cat /proc/${procpid}/stat | awk '{t = $14 + $15;print t}'`
  # calculate process usage cpu time over total usage cpu time as percentage
  typeset -i cpu=$((($proctime2-$proctime)*100/($cputime2-$cputime)))
  [ ! -z $debug ] && echo "Process $1, with pid: $procpid, is wasting: $cpu% of cpu"
  # limit exceed check
  if [ $cpu -gt $limit ];
  then
    # Count the excess
    let hits+=1
    if [ $hits = 1 ];
    then
      times="time"
    else
      times="times"
    fi
    [ ! -z $debug ] && echo "Process $1 has exceeded the limit: $limit ($cpu) $hits $times ..."
    # If hits are greater than 10, kill the process
    if [ $hits -gt 10 ];
    then
      echo -n "Killing process: $procpid ... "
      kill $procpid
      # wait until process die
      sleep 1
      # check if process has died
      if [ -z "`pidof $1`" ];
      then
        echo "Done."
      else
        echo "Can't kill the process."
      fi
      echo "Finished."
      exit 0
    fi
  else
   # if no limit exceed, reset hit counter
   let hits=0
  fi
done

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Author Comment

by:tanel
ID: 35190539
Thank you, i will test it and let you know!
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Author Comment

by:tanel
ID: 35192880
Sorry, it doesn't seem to work.. How to use it correctly ?
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Accepted Solution

by:
crazyn3wf earned 500 total points
ID: 35193152
ya it desent seem to take the PID correctly, guess i should have tested it before posting.
Try this one. its a little simpler

#!/bin/bash

# March-13-2006
# CPUuse trigger script by Noel
#
# bash code to watch a running program's CPU usage.
# if it's above a set value, it will auto send an email.
# You will need to set a Cron job to run this script every xx minutes
#
# Set some needed things:
#
processToWatch="convert" # in my case I need to watch convert
emailAddress="root@host" # this is my main emailaddress
triggerValue=90 # if the CPU use is above 90% send an email. DO NOT USE a DOT or COMMA!
tempFileName=tmp-cpu # some name of the temp file for the ps, grep data

ps auxww | grep "$processToWatch" | grep -v grep > /tmp/$tempFileName
export LINE
(
read LINE
while [ -n "$LINE" ]
do
set $LINE
read LINE
if [ $(echo "$3" | sed -e 's/\.[0-9]*//g') -gt $triggerValue ]; then
mail -s "CPU message alert for: $processToWatch" $emailAddress <<-END
This is to inform you that the following process: $processToWatch with PID (Process ID) $2 is now using more than your preset $triggerValue value.

Process: $processToWatch is using: $3 of CPU power!
The command used is: $11
END
fi
done
)< /tmp/$tempFileName

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Author Comment

by:tanel
ID: 35196837
Heh, i need the script to kill any procces using much CPU, but this one is just sending mail..
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Author Comment

by:tanel
ID: 35198026
Ok, i have edited the script a little bit and it kills now.
Thanks!
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