Arch Linux

bsdson.tw

Member

From: Taiwan

Registered: 2005-05-06

Posts: 161

script automatically "renice" processes if they use too many resources

This script will monitor system processes, and once finds a process using more then allowed cpu resources, it will automatically invoke "cpulimit" to renice the process.

requirements:
bash, cpulimit
(http://aur.archlinux.org/packages.php?d … s=0&SeB=nd),
top(procps), grep, cut(coreutils)

#!/bin/bash

THRESHOLD=90
LIMIT=60
TIMEOUT=8

IFS="
"

while true; do
        top_out=$(top -b -n 1 -i | grep "^\s\+[0-9]")
        
        for i in $top_out; do
                cpu_usage=$(echo -n "$i" | cut -b 42-43)
                
                if [ "$cpu_usage" -gt "$THRESHOLD" ]; then
                        pid=$(echo -n "$i" | cut -b 1-6)
                        cpulimit -p "$pid" -l "$LIMIT" -z >& /dev/null &
                        echo " cpulimit pid=$pid (current cpu usage=$cpu_usage)"
                fi
        done
        
        sleep $TIMEOUT
done

# for
# get top process using cpu resource more then THRESHOLD
# xor with WHITE_LIST
#WHITE_LIST="" # not implement
# xor with BLACK_LIST
#BLACK_LIST="" # not suitable if we limit by PID
# cpulimit it & add to BLACKLIST
# sleep TIMEOUT (default = 15)
# loop

ps. you can put this in /etc/rc.local
     (remember to add a "&" to put it in to the background, or you will not be able to finish booting)

ps2. cpulimit is better executed with root permission, or it will make some problems.

Hope this helps,
BR,
bsdson.tw

Last edited by bsdson.tw (2007-09-11 06:13:41)