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#!/bin/bash
# limit-mythcommflag.sh v0.1 05/17/09
# Utility to automatically limit mythcommflag if CPU usage is above a certain level.
# Uses cpulimit from http://cpulimit.sourceforge.net/
# Free for any use.
# Installation:
# cp limit-mythcommflag.sh /usr/LH/bin
# chmod +x /usr/LH/bin/limit-mythcommflag.sh
# Usage: Executed from runit limit-mythcommflag at boot
# Threshold for when mythcommflag will be paused
CPUTHRESHOLD=43
# Limit mythcommflag to percentage
LIMITCPU=20
# Log file to write (use /dev/null for no log)
#LOG=/var/log/mythtv/limit-mythcommflag.log
LOG=/dev/null
# Number of seconds to wait between checking for mythcommflag process
SLEEP=5
#sleep $SLEEP
touch $LOG
ALREADYLIMITED=0
while true; do
PROCCOMMFLAG=`pidof mythcommflag`
if [ -n "${PROCCOMMFLAG}" ]
then
FRONTENDCPU=`top -bn1u mythtv | grep mythfrontend | awk '{ print $9 }'`
if [ "$FRONTENDCPU" -ge "$CPUTHRESHOLD" ]
then
echo "$(date) FE CPU $FRONTENDCPU% is greater than $CPUTHRESHOLD%, LIMIT Commflagging" # >> $LOG
if [ $ALREADYLIMITED -eq 0 ]; then
cpulimit -e mythcommflag -l $LIMITCPU &
cpulimit_pid=$!
ALREADYLIMITED=1
fi
else
echo "$(date) FE CPU $FRONTENDCPU% is less than $CPUTHRESHOLD%, UNLIMIT Commflagging" #>> $LOG
if [ $ALREADYLIMITED -eq 1 ]; then
kill $cpulimit_pid
ALREADYLIMITED=0
fi
fi
# else
# echo "No COMMFLAG Process Active" >> $LOG
fi
sleep $SLEEP
done
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