一条命令让CPU嗨起来

summerking

发布于 2022-09-19 14:13:22

2770

发布于 2022-09-19 14:13:22

记录用一条命令使CPU瞬间拉满到100%

# 命令

for i in `seq 1 $(cat /proc/cpuinfo |grep "physical id" |wc -l)`; do dd if=/dev/zero of=/dev/null & done

# 效果

[root@summer ~]# for i in `seq 1 $(cat /proc/cpuinfo |grep "physical id" |wc -l)`; do dd if=/dev/zero of=/dev/null & done
[1] 12701
[root@summer ~]# top
top - 15:31:52 up 66 days,  1:27,  1 user,  load average: 0.72, 0.23, 0.17
Tasks:  80 total,   2 running,  78 sleeping,   0 stopped,   0 zombie
%Cpu(s): 32.3 us, 67.7 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :  1882232 total,    75960 free,   400968 used,  1405304 buff/cache
KiB Swap:        0 total,        0 free,        0 used.  1275984 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND                                                                                                                                                                                       
12701 root      20   0  107996    612    520 R 99.3  0.0   0:10.31 dd                                                                                                                                                                                            
14956 root      10 -10  150028  24964   5836 S  0.7  1.3 451:05.52 AliYunDun