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#!/bin/bash
# limit-mythcommflag.sh v0.2 03/2/10
# Utility to automatically limit mythcommflag if CPU system load is above a certain level
# and if backend 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
#-----OPTIONS______
# Number of seconds to wait between checking for mythcommflag process
SLEEP=5
# Backend and Frontend thresholds above which mythcommflag is stopped
BETHRESHOLD=30
FETHRESHOLD=55
# FUNCTIONS
limit_cpu()
# Arg_1 = LimitedRangeNum; Arg_2 = CPULimitPercent; Arg_3 = Commflag PID
{
if [ $ALREADYLIMITED -ne $1 ] ; then
if [ $cpulimit_pid -ne 0 ]; then
kill $cpulimit_pid
fi
cpulimit -p $3 -l $2 &
cpulimit_pid=$!
ALREADYLIMITED=$1
fi
}
stop_limit()
{
if [ $ALREADYLIMITED -ne 0 ]; then
if [ $cpulimit_pid -ne 0 ]; then
kill $cpulimit_pid
cpulimit_pid=0
fi
ALREADYLIMITED=0
fi
}
ALREADYLIMITED=0
STOPPED=0
cpulimit_pid=0
while true; do
PROCCOMMFLAG=`pidof mythcommflag`
if [ -n "${PROCCOMMFLAG}" ]; then
BACKENDCPU=`top -bn1u mythtv | grep -m 1 'mythbackend ' | awk '{ print $9 }'`
FRONTENDCPU=`top -bn1u mythtv | grep -m 1 'mythfrontend ' | awk '{ print $9 }'`
if [ "$FRONTENDCPU" = "" ]; then
FRONTENDCPU=0
fi
if [ "$BACKENDCPU" -ge "$BETHRESHOLD" ]; then
if [ "$FRONTENDCPU" -ge $FETHRESHOLD ]; then
if [ $STOPPED -eq 0 ]; then
kill -s STOP $PROCCOMMFLAG
STOPPED=1
fi
else
if [ $STOPPED -eq 1 ]; then
kill -s CONT $PROCCOMMFLAG
STOPPED=0
fi
stop_limit
fi
else
if [ $STOPPED -eq 1 ]; then
kill -s CONT $PROCCOMMFLAG
STOPPED=0
fi
case $FRONTENDCPU in
[0-9]|[0-3][0-9] )
stop_limit;;
[4-5][0-9] )
limit_cpu "1" "70" $PROCCOMMFLAG;;
[6-7][0-9] )
limit_cpu "2" "50" $PROCCOMMFLAG;;
[8-9][0-9] )
limit_cpu "3" "20" $PROCCOMMFLAG;;
[1][0-9][0-9] )
limit_cpu "4" "10" $PROCCOMMFLAG;;
esac
fi
# else
# echo "No COMMFLAG Process Active"
fi
sleep $SLEEP
done
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