[Original] shell scripts that consume CPU resources

CPU resources are consumed in an endless loop. If the server has multiple CPUs, you can select the number of CPU resources to be consumed:

#! /bin/sh # filename killcpu.shif [ $# != 1 ] ; then  echo "USAGE: $0 <CPUs>"  exit 1;fifor i in `seq $1`do  echo -ne " i=0; while true do i=i+1; done" | /bin/sh &  pid_array[$i]=$! ;donefor i in "${pid_array[@]}"; do  echo 'kill ' $i ';';done

The usage is very simple. Parameter 3 indicates that three CPU resources are consumed. After running, there will be a bunch of kill commands to facilitate the kill process:

[root@test02 ~]# ./killcpu.sh 3kill  30104 ;kill  30106 ;kill  30108 ;[root@test02 ~]# top top - 15:27:31 up 264 days, 23:39,  4 users,  load average: 0.86, 0.25, 0.19Tasks: 185 total,   5 running, 180 sleeping,   0 stopped,   0 zombieCpu0  : 100.0% us,  0.0% sy,  0.0% ni,  0.0% id,  0.0% wa,  0.0% hi,  0.0% siCpu1  :  0.0% us,  0.0% sy,  0.0% ni, 100.0% id,  0.0% wa,  0.0% hi,  0.0% siCpu2  : 100.0% us,  0.0% sy,  0.0% ni,  0.0% id,  0.0% wa,  0.0% hi,  0.0% siCpu3  : 100.0% us,  0.0% sy,  0.0% ni,  0.0% id,  0.0% wa,  0.0% hi,  0.0% siMem:   8165004k total,  8095880k used,    69124k free,    53672k buffersSwap:  2031608k total,   103548k used,  1928060k free,  6801364k cached