[New-bugs-announce] [issue10239] multiprocessing signal defect
Neal Becker
report at bugs.python.org
Sat Oct 30 01:16:55 CEST 2010
New submission from Neal Becker <ndbecker2 at gmail.com>:
multiprocessing signal defect
From:
Neal Becker <ndbecker2 at gmail.com>
Date:
Friday 29 October 2010 8:12:19 am
To:
python-list at python.org
Groups:
gmane.comp.python.general
Tested on:
python-2.6.4-27.fc13.x86_64
linux fedora 13 x86_64
Seems multiprocessing doesn't behave well with signals:
-----------
from multiprocessing import Pool
import time
def sleep (dummy):
time.sleep (10)
if __name__ == '__main__':
pool = Pool (processes=2)
result = pool.map (sleep, range (4))
-------------
start it up
$ python test_multip.py
----------------------
ps auxf | grep python
nbecker 6605 1.6 0.1 338192 6952 pts/1 Sl+ 08:03 0:00 | \_
python test_multip.py
nbecker 6606 0.0 0.1 186368 4760 pts/1 S+ 08:03 0:00 |
\_ python test_multip.py
nbecker 6607 0.0 0.1 186372 4740 pts/1 S+ 08:03 0:00 |
\_ python test_multip.py
kill 6607
ps auxf | grep python
nbecker 6605 0.5 0.1 338192 6952 pts/1 Sl+ 08:03 0:00 | \_
python test_multip.py
nbecker 6606 0.0 0.1 186368 4760 pts/1 S+ 08:03 0:00 |
\_ python test_multip.py
nbecker 6607 0.0 0.0 0 0 pts/1 Z+ 08:03 0:00 |
\_ [python] <defunct>
kill 6606
ps auxf | grep python
nbecker 6605 0.3 0.1 338192 6952 pts/1 Sl+ 08:03 0:00 | \_
python test_multip.py
nbecker 6606 0.0 0.0 0 0 pts/1 Z+ 08:03 0:00 |
\_ [python] <defunct>
nbecker 6607 0.0 0.0 0 0 pts/1 Z+ 08:03 0:00 |
\_ [python] <defunct>
Now we have 2 dead children and the parent is hung forever.
Isn't this a serious defect?
----------
components: Library (Lib)
messages: 119948
nosy: Neal.Becker
priority: normal
severity: normal
status: open
title: multiprocessing signal defect
type: behavior
versions: Python 2.6
_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10239>
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