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[Python-Dev] A new dictionary implementation
Yury Selivanovyselivanov.ml at gmail.com
Wed Feb 15 22:09:17 CET 2012
Hello Mark,First, I've back-ported your patch on python 3.2.2 (which was relativelyeasy). Almost all tests pass, and those that don't are always failing onmy machine if I remember. The patch can be found here:http://goo.gl/nSzzYThen, I compared memory footprint of one of our applications (300,000 LOC) and saw it about 6% less than on vanilla python 3.2.2 (660 MB of reservedprocess memory compared to 702 MB; Linux Gentoo 64bit) The application is written in heavy OOP style (for instance, ~1000 classes are generated by our ORM on the fly, and there are approximately the same amount of hand-written ones) so I hoped for a much bigger saving.As for the patch itself I found one use-case, where python with the patchbehaves differently:: class Foo: def __init__(self, msg): self.msg = msg f = Foo('123') class _str(str): pass print(f.msg) print(getattr(f, _str('msg')))The above snippet works perfectly on vanilla py3.2, but fails on the patched one (even on 3.3 compiled from your 'cpython_new_dict' branch) I'm not surethat it's a valid code, though. If not, then we need to fix some python internals to add exact type check in 'getattr', in the 'operator.getattr', etc. And if it is - your patch needs to be fixed. In any case, I propose to add the above code to the python test-suite, with either expecting a result or an exception.Cheers,YuryOn 2012-02-15, at 12:58 PM, Mark Shannon wrote:> Any opinions on my new dictionary implementation?>> I'm happy to take silence on the PEP as tacit approval,> but the code definitely needs reviewing.>> Issue:>http://bugs.python.org/issue13903>> PEP:>https://bitbucket.org/markshannon/cpython_new_dict/src/6c4d5d9dfc6d/pep-new-dict.txt>> Repository>https://bitbucket.org/markshannon/cpython_new_dict>> Cheers,> Mark.> _______________________________________________> Python-Dev mailing list>Python-Dev at python.org>http://mail.python.org/mailman/listinfo/python-dev> Unsubscribe:http://mail.python.org/mailman/options/python-dev/yselivanov.ml%40gmail.com
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