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[WIP] bpo-27535: Optimize warnings #4502

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[WIP] bpo-27535: Optimize warnings #4502

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@vstinner vstinner commented Nov 22, 2017 •
edited by bedevere-bot
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  • bpo-27535: Fix memory leak with warnings ignore
  • bpo-27535: Optimize warnings.warn()
  • C cache
  • warnings.filters becomes an immutable tuple

https://bugs.python.org/issue27535

@vstinner
bpo-27535: Fix memory leak with warnings ignore
4153566 
The warnings module doesn't leak memory anymore in the hidden
warnings registry for the "ignore" action of warnings filters.

The warn_explicit() function doesn't add the warning key to the
registry anymore for the "ignore" action.
@vstinner
bpo-27535: Optimize warnings.warn()
b0c8ad5 
* Optimize warnings.filterwarnings(). Replace re.compile('') with
  None to avoid the cost of calling a regex.match() method, whereas
  it always matchs.
* Optimize get_warnings_attr(): replace PyObject_GetAttrString() with
  _PyObject_GetAttrId().
@vstinner
C cache
3455541
@vstinner
warnings.filters becomes an immutable tuple
caf78aa 
Make it more explicit that warnings.filters must not be replaced
directly, but modified by:

* filterwarning()
* simplefilter()
* resetwarnings()
@vstinner
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Oh, the latest commit "warnings.filters becomes an immutable tuple" broke regrtest --huntrefleak:

haypo@selma$ ./python -m test -R 3:3 test_os -m test_access
Run tests sequentially
0:00:00 load avg: 1.76 [1/1] test_os
beginning 6 repetitions
123456
test test_os crashed -- Traceback (most recent call last):
  File "/home/haypo/prog/python/master/Lib/test/libregrtest/runtest.py", line 178, in runtest_inner
    refleak = dash_R(the_module, test, test_runner, ns.huntrleaks)
  File "/home/haypo/prog/python/master/Lib/test/libregrtest/refleak.py", line 64, in dash_R
    abcs)
  File "/home/haypo/prog/python/master/Lib/test/libregrtest/refleak.py", line 119, in dash_R_cleanup
    warnings.filters[:] = fs
TypeError: 'tuple' object does not support item assignment

@vstinner vstinner mentioned this pull request Nov 23, 2017
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While the speedup is interesting, these changes are backward incompatible and I'm not sure that it's acceptable. I prefer to close my PR.

@vstinner vstinner closed this Nov 27, 2017
@vstinner vstinner deleted the warn_optim branch November 27, 2017 15:58
@ghost ghost mentioned this pull request Sep 12, 2022
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