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#!/bin/bash
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# Destription: test cpu usage
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# Example    : sh cpu_usage.sh consume 8 | sh cpu_usage.sh release
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FILE_NAME=`basename $0`
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cpunum=$2
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pid_array=()
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function usage()
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{
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echo "Usage:$FILE_NAME consume cpu_number|release -----the value of cpu_number is an integer,such as 1,2,3"
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echo "Example: $FILE_NAME consume 12"
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echo "         $FILE_NAME release"
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}
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function endless_loop()
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{
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echo -ne "i=0;
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while true
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do
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    i=i+100;
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    i=100
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done" | /bin/bash &
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}
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function consume()
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{
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for i in `seq $1`
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do
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    endless_loop
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    pid_array[$i]=$!
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done
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echo "consume cpu resources process ids are: ${pid_array[*]}"
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}
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function release()
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{
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for pid in $(ps -ef |grep /bin/bash |grep -v grep |awk '{print $2}' |xargs)
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do
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    kill -9 $pid
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done
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}
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function main()
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{
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case "$1" in
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    consume) consume $cpunum;;
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    release) release;;
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          *) usage;exit 1;;
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esac
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}
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main $*