Arkadiusz Miśkiewicz <ar...@maven.pl> added the comment:
Bisecting led to this commit and reverting it on 3.8 branch makes the hang go
away.
7c994549dcffd0d9d3bb37475e6374f356e7240e is the first bad commit
commit 7c994549dcffd0d9d3bb37475e6374f356e7240e
Author: Pablo Galindo <pablog...@gmail.com>
Date: Sat Mar 16 22:34:24 2019 +0000
bpo-35493: Use Process.sentinel instead of sleeping for polling worker
status in multiprocessing.Pool (#11488)
* bpo-35493: Use Process.sentinel instead of sleeping for polling worker
status in multiprocessing.Pool
* Use self-pipe pattern to avoid polling for changes
* Refactor some variable names and add comments
* Restore timeout and poll
* Use reader object only on wait()
* Recompute worker sentinels every time
* Remove timeout and use change notifier
* Refactor some methods to be overloaded by the ThreadPool, document the
cache class and fix typos
Lib/multiprocessing/pool.py | 88 +++++++++++++++++++---
.../2019-01-09-23-43-08.bpo-35493.kEcRGE.rst | 3 +
2 files changed, 80 insertions(+), 11 deletions(-)
create mode 100644
Misc/NEWS.d/next/Library/2019-01-09-23-43-08.bpo-35493.kEcRGE.rst
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<https://bugs.python.org/issue38744>
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