..function::sched_getaffinity(pid, /)

Return the set of CPUs the process with PID *pid* (or the current process

if zero) is restricted to.

Return the set of CPUs the process with PID *pid* is restricted to.

If *pid* is zero, return the set of CPUs the calling thread of the current

process is restricted to.

.. _os-path:

..function::cpu_count()

Return the number of CPUs in the system. Returns ``None`` if undetermined.

This number is not equivalent to the number of CPUs the current process can

use. The number of usable CPUs can be obtained with

``len(os.sched_getaffinity(0))``

Return the number of logical CPUs in the system. Returns ``None`` if

undetermined.

This number is not equivalent to the number of logical CPUs the current

process can use. ``len(os.sched_getaffinity(0))`` gets the number of logical

CPUs the calling thread of the current process is restricted to

..versionadded::3.4

deftest_sched_setaffinity(self):

mask=posix.sched_getaffinity(0)

self.addCleanup(posix.sched_setaffinity,0,list(mask))

iflen(mask)>1:

mask.pop()