Kill CPU hogs from CRON - a poor man's Monit

killhogs.sh

#!/bin/bash

# tries to kill process with highest CPU load
# (if it is part of a specified list of troublemakers)

MAXLOAD=5
TROUBLEMAKERS="chrome"

sleep 1 # wait a few seconds (just as a precaution)

TOPPROCESS=$(top -b -n 1 | sed 1,6d | sed -n 2p)
TOPPID=$(echo "$TOPPROCESS" | awk '{print $1}')
TOPNAME=$(echo "$TOPPROCESS" | awk '{print $12}')
LOAD=$(uptime | awk '{print $10}' | cut -d "," -f 1)

if [[ "$TROUBLEMAKERS" == *"$TOPNAME"* ]]; then
  if [[ "$LOAD" -gt "$MAXLOAD" ]]
    then
       echo "Cause of high CPU load: "$TOPNAME" ("$TOPPID")"
       echo "In troublemaker list. Killing..."
       kill -9 $TOPPID
    else
       echo "Cause of high CPU load: "$TOPNAME" ("$TOPPID")"
       echo "Not above MAXCPU threshold. Exiting..."
       exit 1
  fi
else
    echo "Cause of high CPU load: "$TOPNAME" ("$TOPPID")"
    echo "Not in troublemaker list. Exiting..."
    exit 1
fi

exit 0

killhogs_nolog.sh

#!/bin/bash

# tries to kill process with highest CPU load
# (if it is part of a specified list of troublemakers)

MAXLOAD=5
TROUBLEMAKERS="chrome gnome-keyring-daemon"

sleep 1 # wait a few seconds (just as a precaution)

TOPPROCESS=$(top -b -n 1 | sed 1,6d | sed -n 2p)
TOPPID=$(echo "$TOPPROCESS" | awk '{print $1}')
TOPNAME=$(echo "$TOPPROCESS" | awk '{print $12}')
LOAD=$(uptime | awk '{print $10}' | cut -d "," -f 1)

if [[ "$TROUBLEMAKERS" == *"$TOPNAME"* ]]; then
  echo "$LOAD, $MAXLOAD"
  if [[ ${LOAD#0} -gt ${MAXLOAD#0} ]]; then
      echo "Cause of high CPU load: $TOPNAME ($TOPPID)"
      echo "Killing..."
      kill -9 $TOPPID
  fi
fi

exit 0