From 1f130b694594f2f264fd4891dad7ad68dbb64d08 Mon Sep 17 00:00:00 2001 From: Vinay Sajip Date: Mon, 22 Jul 2019 11:58:30 +0100 Subject: [PATCH] Update logging cookbook to show multiple worker processes using the concurrent.futures module. --- Doc/howto/logging-cookbook.rst | 35 ++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/Doc/howto/logging-cookbook.rst b/Doc/howto/logging-cookbook.rst index 87ac79ef8072d6..e62308192d1655 100644 --- a/Doc/howto/logging-cookbook.rst +++ b/Doc/howto/logging-cookbook.rst @@ -948,6 +948,41 @@ This variant shows how you can e.g. apply configuration for particular loggers machinery in the main process (even though the logging events are generated in the worker processes) to direct the messages to the appropriate destinations. +Using concurrent.futures.ProcessPoolExecutor +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +If you want to use :class:`concurrent.futures.ProcessPoolExecutor` to start +your worker processes, you need to create the queue slightly differently. +Instead of + +.. code-block:: python + + queue = multiprocessing.Queue(-1) + +you should use + +.. code-block:: python + + queue = multiprocessing.Manager().Queue(-1) # also works with the examples above + +and you can then replace the worker creation from this:: + + workers = [] + for i in range(10): + worker = multiprocessing.Process(target=worker_process, + args=(queue, worker_configurer)) + workers.append(worker) + worker.start() + for w in workers: + w.join() + +to this (remembering to first import :mod:`concurrent.futures`):: + + with concurrent.futures.ProcessPoolExecutor(max_workers=10) as executor: + for i in range(10): + executor.submit(worker_process, queue, worker_configurer) + + Using file rotation -------------------