linux模拟cpu占用100%脚本

linux模拟cpu占用100%脚本
vi killcpu.sh 脚本如下

#! /bin/sh 
# filename killcpu.sh
if [ $# -ne 1 ] ; then
  echo "USAGE: $0 <CPUs>|stop"
  exit 1;
fi

stop()
{
while read LINE
  do
    kill -9 $LINE
    echo "kill $LINE sucessfull"
  done < pid.txt
cat /dev/null > pid.txt
}

start()
{
  echo "u want to cpus is: "$1
  for i in `seq $1`
do
  echo -ne " 
i=0; 
while true
do
i=i+1; 
done" | /bin/sh &
  pid_array[$i]=$! ;
done

for i in "${pid_array[@]}"; do
  echo 'pid is: ' $i ';';
  echo $i >> pid.txt
done
}

case $1 in
  stop)
    stop
  ;;
  *)
  start $1
;;
esac

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运行方式：
chmod 777 killcpu.sh 修改文件权限777
./killcpu.sh 3 启动3个线程
top 查看cpu消耗

停止：
killcpu.sh stop