Disabling a CPU in running Linux System

• The following command will disable a CPU:

# echo 0 > /sys/devices/system/cpu/cpuX/online

where X is the ID of the CPU as determined from /proc/cpuinfo.

• To re-enable the CPU, run:

# echo 1 > /sys/devices/system/cpu/cpuX/online

verify  by # cat /proc/cpuinfo