Set CPU limits on pattern matched processes

climit.to

#!/bin/bash
# A.J <andrwj@gmail.com>
# 2013-12-27
# v0.0.2
#
# set cpu limit on pattern matched processes
# default limit value: 10%
# usage:
#    climit.to <['process-name' | 'kill-all']> [value-to-limit-in-percentage]"
#
default_target=__none__
temporary_list_file="/tmp/$$.list"
previous_cpulimit_pid_file="/tmp/$$.dup"
target=${1:-$default_target}
limit=${2:-10}
cmd=/usr/local/bin/cpulimit
# don't left garbage ..
function clean_up {
    rm -f $temporary_list_file
    rm -f $previous_cpulimit_pid_file
    echo
}
trap clean_up SIGHUP SIGINT SIGTERM

if [[ "$target" == "__none__" ]]; then
    echo "CPU limit for all matched processes v0.0.1 by A.J<andrwj@gmail.com>"
    echo "Usage: climit.to <['process-name'|'kill-all']> [value-to-limit-in-percentage]"
    echo "  i.e: climit.to 'Google Chrome Helper' 10"
    echo ""
    echo "-- running cpulimits -- "
    ps -ax | grep cpulimit | grep '\-\-pid='
    clean_up
fi

if [[ "$target" == "kill-all" ]]; then
    echo -n "stopping all cpu-limits ..."
    killall cpulimit
    clean_up
fi

if [[ ! -e "$cmd" ]]; then
    echo "- compile and install: cpulimit ..."
    brew install cpulimit
    if [[ $? -ne 0 ]]; then
        echo
        echo "- cpulimit is not presented. abort ";
        echo
        clean_up
    fi
    echo
fi

ps -ax | grep "$target" > $temporary_list_file
while IFS=' ' read -r process_id tty _time path args; do
        # damn ;-)
        if [[ "$path" == "grep" || "$path" == "/bin/bash" ]]; then
            continue;
        fi
        rm -f $previous_cpulimit_pid_file
        ps -ax | grep 'cpulimit' | grep "pid=$process_id" > $previous_cpulimit_pid_file
        while IFS=' ' read -r previous_cpulimit_pid dummy dummy; do
            if [[ ! -z $previous_cpulimit_pid ]]; then
                echo
                echo -n "- Cancel previous cpulimit process($previous_cpulimit_pid) ..."
                kill -TERM $previous_cpulimit_pid > /dev/null
                if [ $? -eq 0 ]; then
                    echo " ok"
                else
                    echo " failed. you should check out."
                fi
            fi
        done <"$previous_cpulimit_pid_file"

        $cmd --limit=$limit --pid=$process_id -z  2>&1 > /dev/null &
        echo "=> Set cpu usage limitation '${limit}%' to the process($path)"
done <"$temporary_list_file"

clean_up