disable cpu

Posted 2020-08-22 杏子肥

根据我现在的判断，disable cpu 有两种方式。

第一种，在root的时候，进行 disable

Choose ‘e‘ and you get to a command line where you can add options.

You can also create permanent boot option in grub by making a copy of your current boot option and add maxcpus=1 to the boot parameters. You can name this ‘Ubuntu, kernel 2.5.12-9-386 (1 cpu)‘ and have it amongst the other boot options like the picture shows.

You can verify running on 1 cpu by issuing:

cat /proc/cpuinfo   | grep processor this should show something like this:

第二种，进行 Hotplug

You can dynamically disable CPUs via /sys/devices/system/cpu/cpuN/online, for example to disable CPU 1, use:

echo 0 | sudo tee /sys/devices/system/cpu/cpu1/online

cat /sys/devices/system/cpu/online  (to check online cpu)
cat /sys/devices/system/cpu/offline   (to check offline cpu)

re-enable, use:

echo 1 | sudo tee /sys/devices/system/cpu/cpu1/online

 

见网页：http://askubuntu.com/questions/46011/is-it-possible-to-disable-a-cpu-not-a-core  

　　　　https://www.cyberciti.biz/faq/debian-rhel-centos-redhat-suse-hotplug-cpu/

 

tee 是需要有sudo 权限才能运行的。