How to check # of CPU on Mac

Mac OS does not support proc file system (/proc) as it is based on FreeBSD.

To check the number of CPU, the following commands can be used.

sysctl -n hw.ncpu

This is equivalent to the logical CPU numbers as following.

sysctl -n hw.logicalcpu

The number of physical CPU can be retrieved with the following command.

sysctl -n hw.physicalcpu