1:安装stress-ng

[root@kolla ~]# yum install stress-ng
[root@kolla ~]# rpm -qa |grep stress
stress-ng-0.07.29-2.el7.x86_64

2:指定cpu进行压测

taskset -c 2 stress-ng --cpu 1 --cpu-load 70 --timeout 20h

taskset:指定使用哪个cpu
--cpus:开启几个线程
--cpu-load:指定cpu的压测负载
--timeout:压测时间

3:top查看系统cpu使用率

top命令查看:
top - 17:23:17 up 4 days, 23:44,  3 users,  load average: 0.32, 0.41, 0.55
Tasks: 157 total,   2 running, 155 sleeping,   0 stopped,   0 zombie
%Cpu(s):  8.9 us,  0.0 sy,  0.0 ni, 91.1 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem : 16265380 total, 12369264 free,   673684 used,  3222432 buff/cache
KiB Swap:        0 total,        0 free,        0 used. 13155812 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                               
20292 root      20   0   56984   6276   1228 R  71.1  0.0   0:21.33 stress-ng-cpu                                                                                         
    1 root      20   0  191164   4248   2652 S   0.0  0.0   0:36.13 systemd                                                                                               
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.06 kthreadd                                                                                              
    4 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0H                                                                                          
    5 root      20   0       0      0      0 S   0.0  0.0   0:00.00 kworker/u16:0                                                                                         
    6 root      20   0       0      0      0 S   0.0  0.0   0:00.25 ksoftirqd/0    

4:mpstat查看结果如下

[root@kolla ~]# mpstat -P ALL 5
Linux 3.10.0-1062.1.1.el7.x86_64 (kolla) 	11/11/2021 	_x86_64_	(8 CPU)

05:24:09 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest  %gnice   %idle
05:24:14 PM  all    8.65    0.00    0.05    0.00    0.00    0.00    0.00    0.00    0.00   91.30
05:24:14 PM    0    0.20    0.00    0.20    0.00    0.00    0.00    0.00    0.00    0.00   99.60
05:24:14 PM    1    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
05:24:14 PM    2   68.74    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00   31.26
05:24:14 PM    3    0.00    0.00    0.20    0.00    0.00    0.00    0.00    0.00    0.00   99.80
05:24:14 PM    4    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
05:24:14 PM    5    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
05:24:14 PM    6    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
05:24:14 PM    7    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00

05:24:14 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest  %gnice   %idle
05:24:19 PM  all    8.90    0.00    0.03    0.00    0.00    0.00    0.00    0.00    0.00   91.07
05:24:19 PM    0    0.20    0.00    0.20    0.00    0.00    0.00    0.00    0.00    0.00   99.60
05:24:19 PM    1    0.20    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00   99.80
05:24:19 PM    2   70.74    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00   29.26
05:24:19 PM    3    0.20    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00   99.80
05:24:19 PM    4    0.20    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00   99.80
05:24:19 PM    5    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
05:24:19 PM    6    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
05:24:19 PM    7    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
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