CPUCTL(8) System Manager's Manual CPUCTL(8)

cpuctl — program to control CPUs

cpuctl command [arguments]

The cpuctl command can be used to control and inspect the state of CPUs in the system.

The first argument, command, specifies the action to take. Valid commands are:

list
For each CPU in the system, display the current state and time of the last state change.
offline cpu [cpu ...]
Set the specified CPUs off line.

At least one CPU in the system must remain on line.

online cpu [cpu ...]
Set the specified CPUs on line.

Run

cpuctl offline 2
and then
cpuctl list
The output should reflect the fact that CPU#2 was taken offline.
March 18, 2019 Darwin