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[Python-Dev] Type creation speed

Antoine Pitrou solipsis at pitrou.net
Fri Dec 15 12:50:58 EST 2017

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On Fri, 15 Dec 2017 19:18:11 +0200
Serhiy Storchaka <storchaka at gmail.com> wrote:
> 15.12.17 18:36, Antoine Pitrou пише:
> > Do you have any general idea how to speed up class creation?  
> 
> Some work was done in [https://bugs.python.org/issue31336]. Currently I 
> have no ideas.
> 
> Creating a class is 1-2 orders slower than creating a function. And 
> adding parent classes significantly slows down it.

I made simple, approximate measurements with an empty class:

- fixup_slot_dispatchers() takes 78% of the time (!)
- __build_class__() takes 5%
- computing the default __qualname__, __module__, __doc__ takes 3%
- set_names() takes 2.5%
- init_subclass() takes 2.5%

Regards

Antoine.

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