Created on 2011-03-25 21:02 by mark.dickinson, last changed 2011-03-26 10:26 by mark.dickinson. This issue is now closed.
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| File name | Uploaded | Description | Edit | |
| issue11675.patch | mark.dickinson, 2011-03-25 21:33 | review | ||
| Messages (7) | |||
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| msg132153 - (view) | Author: Mark Dickinson (mark.dickinson) *  |
Date: 2011-03-25 21:02 | |
The documentation for the multiprocessing module says:
"If size_or_initializer is an integer, then it determines the length of the array, and the array will be initially zeroed. "
But the part about the array being zeroed doesn't seem to be true:
Python 3.3a0 (default:03c7a83bbdd3, Mar 25 2011, 21:00:37)
[GCC 4.2.1 (Apple Inc. build 5664)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from multiprocessing import Array
[67297 refs]
>>> arr1 = Array('i', [56, 27, 1729])
[79877 refs]
>>> del arr1
[79805 refs]
>>> arr2 = Array('i', 3)
[79876 refs]
>>> list(arr2) # expect [0, 0, 0]
[56, 27, 1729]
[79882 refs]
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| msg132155 - (view) | Author: Mark Dickinson (mark.dickinson) * |
Date: 2011-03-25 21:10 | |
Since this behaviour seems to have been present since at least Python 2.6, it's tempting to call this a documentation bug. |
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| msg132159 - (view) | Author: Mark Dickinson (mark.dickinson) * |
Date: 2011-03-25 21:33 | |
Here's a patch that adds zeroing. |
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| msg132161 - (view) | Author: Antoine Pitrou (pitrou) * |
Date: 2011-03-25 21:38 | |
+1 for predictable behaviour and therefore zeroing of uninitialized arrays. |
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| msg132165 - (view) | Author: Jesse Noller (jnoller) * |
Date: 2011-03-25 22:00 | |
I concur with Antoine. I think you're good to go Mark. |
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| msg132222 - (view) | Author: Roundup Robot (python-dev) | Date: 2011-03-26 10:02 | |
New changeset 2af0c2c106ea by Mark Dickinson in branch '2.7': Issue #11675: Zero-out newly-created multiprocessing.[Raw]Array objects. http://hg.python.org/cpython/rev/2af0c2c106ea |
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| msg132225 - (view) | Author: Roundup Robot (python-dev) | Date: 2011-03-26 10:23 | |
New changeset 0cb276628528 by Mark Dickinson in branch '3.1': Issue #11675: Zero-out newly-created multiprocessing.[Raw]Array objects. http://hg.python.org/cpython/rev/0cb276628528 New changeset 64ab52a64cc9 by Mark Dickinson in branch '3.2': Merge #11675 http://hg.python.org/cpython/rev/64ab52a64cc9 New changeset f60e55b14d92 by Mark Dickinson in branch 'default': Merge #11675 http://hg.python.org/cpython/rev/f60e55b14d92 |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2011-03-26 10:26:53 | mark.dickinson | set | status: open -> closed assignee: mark.dickinson resolution: fixed stage: resolved |
| 2011-03-26 10:23:34 | python-dev | set | messages: + msg132225 |
| 2011-03-26 10:02:46 | python-dev | set | nosy:
+ python-dev messages: + msg132222 |
| 2011-03-25 22:00:52 | jnoller | set | messages: + msg132165 |
| 2011-03-25 21:38:30 | pitrou | set | nosy:
+ pitrou messages: + msg132161 |
| 2011-03-25 21:33:38 | mark.dickinson | set | files:
+ issue11675.patch keywords: + patch messages: + msg132159 |
| 2011-03-25 21:10:51 | mark.dickinson | set | messages: + msg132155 |
| 2011-03-25 21:02:04 | mark.dickinson | create | |