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Diffstat (limited to 'Doc/library/multiprocessing.rst')
| -rw-r--r-- | Doc/library/multiprocessing.rst | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst index be6c28c..fcf4e14 100644 --- a/Doc/library/multiprocessing.rst +++ b/Doc/library/multiprocessing.rst @@ -644,8 +644,9 @@ primitives like locks. For passing messages one can use :func:`Pipe` (for a connection between two processes) or a queue (which allows multiple producers and consumers). -The :class:`Queue`, :class:`SimpleQueue` and :class:`JoinableQueue` types are multi-producer, -multi-consumer FIFO queues modelled on the :class:`queue.Queue` class in the +The :class:`Queue`, :class:`SimpleQueue` and :class:`JoinableQueue` types +are multi-producer, multi-consumer :abbr:`FIFO (first-in, first-out)` +queues modelled on the :class:`queue.Queue` class in the standard library. They differ in that :class:`Queue` lacks the :meth:`~queue.Queue.task_done` and :meth:`~queue.Queue.join` methods introduced into Python 2.5's :class:`queue.Queue` class. @@ -883,8 +884,13 @@ Miscellaneous .. function:: cpu_count() - Return the number of CPUs in the system. May raise - :exc:`NotImplementedError`. + Return the number of CPUs in the system. + + 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))`` + + May raise :exc:`NotImplementedError`. .. seealso:: :func:`os.cpu_count` |