[Twisted-Python] Performance issue in reactor.callLater

Itamar Shtull-Trauring itamar at itamarst.org
Tue Sep 7 14:28:34 EDT 2004


On Tue, 2004-09-07 at 14:13, Glyph Lefkowitz wrote:

> >    heapq.py is under the PSF license.  PSF is roughly similar to MIT. 
> > Is this going to be okay for inclusion in Twisted?
> 
> It's part of Python, so I don't see why that would be necessary.

This is patched / somehow different version.

> However, I have profiled various heapq-based schemes for callLater in
> the past, and they always end up losing pretty big in the average case,
> and winning only in perverse cases such as hundreds of callLater(0)s per
> tick.  I saw a little discussion of the performance impact, but I am
> still not entirely convinced that it's a good idea.
> 

Obviously we wouldn't commit without further performance testing.





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