[ quesa-Bugs-902950 ] Improve view state stack performance

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Bugs item #902950, was opened at 2004-02-23 20:10
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Dair Grant (grantd)
Assigned to: Nobody/Anonymous (nobody)
Summary: Improve view state stack performance

Initial Comment:
A  performance bottleneck at present is that pushing/popping the 
view state stack is quite expensive.

This could be improved by doing some kind of lazy-updating of the 
stack, where values would only be pushed if they were changed 
since the view state was 'pushed'.


------- Additional Comments From Dair Grant 2002-04-17 09:58 
-------

Additional comments from Erik Olson:

> Profiling under Quesa did reveal that about one third of cpu 
> time was spent copying and destructing attribute sets on 
> stack pops. An optimization would be to have lazy 
> construction of the stack frame's attribute set. 
> 
> I rely on the stack to unwind hierarchical matrix transforms 
> and infrequent color highlights, so most of the time the 
> attribute set is constant.


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https://sourceforge.net/tracker/?func=detail&atid=442052&aid=902950&group_id=45158