STINNER Victor <victor.stin...@gmail.com> added the comment:
I created PR 4489 to fix the memory leak for the "ignore "action". IMHO it's
interesting to modify the "ignore" action because Python uses ignore many
warnings by default:
haypo@selma$ python3 -c 'import pprint, warnings;
pprint.pprint(warnings.filters)'
[('ignore', None, <class 'DeprecationWarning'>, None, 0),
('ignore', None, <class 'PendingDeprecationWarning'>, None, 0),
('ignore', None, <class 'ImportWarning'>, None, 0),
('ignore', None, <class 'BytesWarning'>, None, 0),
('ignore', None, <class 'ResourceWarning'>, None, 0)]
I created memory2.py (based on attached memory.py) to measure the leak.
Currently, the "always" action doesn't leak, but "ignore" and "default" actions
leak:
haypo@selma$ ./python -W always memory2.py
Memory peak grow: +3.2 kB
Warning filters:
[('always',
re.compile('', re.IGNORECASE),
<class 'Warning'>,
re.compile(''),
0),
('ignore', None, <class 'BytesWarning'>, None, 0),
('always', None, <class 'ResourceWarning'>, None, 0)]
haypo@selma$ ./python -W ignore memory2.py
Memory peak grow: +26692.3 kB
Warning filters:
[('ignore',
re.compile('', re.IGNORECASE),
<class 'Warning'>,
re.compile(''),
0),
('ignore', None, <class 'BytesWarning'>, None, 0),
('always', None, <class 'ResourceWarning'>, None, 0)]
haypo@selma$ ./python -W default memory2.py
Memory peak grow: +26693.2 kB
Warning filters:
[('default',
re.compile('', re.IGNORECASE),
<class 'Warning'>,
re.compile(''),
0),
('ignore', None, <class 'BytesWarning'>, None, 0),
('always', None, <class 'ResourceWarning'>, None, 0)]
With my PR 4489, the "ignore" action doesn't leak anymore:
haypo@selma$ ./python -W ignore memory2.py
Memory peak grow: +2.4 kB
Warning filters:
[('ignore',
re.compile('', re.IGNORECASE),
<class 'Warning'>,
re.compile(''),
0),
('ignore', None, <class 'BytesWarning'>, None, 0),
('always', None, <class 'ResourceWarning'>, None, 0)]
----------
Added file: https://bugs.python.org/file47281/memory2.py
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<https://bugs.python.org/issue27535>
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