Issue1102

classification

Title:	__getattribute__ performance on new-style instances should be improved
Type:		Severity:	normal
Components:	Core	Versions:

process

Status:	open	Resolution:
Dependencies:		Superseder:
Assigned To:		Nosy List:	leosoto
Priority:	normal	Keywords:

Created on 2008-08-11.21:42:07 by leosoto, last changed 2008-12-17.19:49:24 by fwierzbicki.

Messages
msg3422 (view)	Author: Leonardo Soto (leosoto)	Date: 2008-08-11.21:42:05
Currently, almost every lookup on a new-style instance (*Derived) does in fact two lookups: first finds the '__getattribute__' slot in the type mro, then the actual attribute lookup takes place. And, if __getattribute__ raises AttributeError, another mro lookup takes place, this time for __getattr__. This is somewhat solved on old-style instances (PyInstance), where the __getattr__ slot is cached on PyClass. Although it has a problem: the cache is not invalidated/refreshed when the __getattr__ slot is dinamically changed.
msg3424 (view)	Author: Leonardo Soto (leosoto)	Date: 2008-08-11.22:20:57
We also should take into account that __bases__ can be dynamically changed: http://bugs.python.org/issue635933

History
Date	User	Action	Args
2008-12-17 19:49:24	fwierzbicki	set	priority: normal
2008-08-11 22:20:58	leosoto	set	messages: + msg3424
2008-08-11 21:42:07	leosoto	create