[Patches] [ python-Patches-1700288 ] Armin's method cache optimization updated for Python 2.6

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Patches item #1700288, was opened at 2007-04-13 12:16
Message generated for change (Comment added) made by nnorwitz
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Category: Performance
Group: Python 2.6
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Kevin Jacobs (bioinformed)
Assigned to: Raymond Hettinger (rhettinger)
Summary: Armin's method cache optimization updated for Python 2.6

Initial Comment:
I've forward ported and slightly cleaned up Armin's method cache patch (see #1685986).  I've attempted to clarify and tighten up several loose ends in the code, so hopefully I haven't mucked anything up.

My performance results are not quite as good as Armin's, though still very encouraging.  I see a typical speed up of 10%, with heavily object oriented application code seeing speedups of 15-20%.  Given these rather significant results, the major task is to verify correctness.


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>Comment By: Neal Norwitz (nnorwitz)
Date: 2007-04-13 23:21

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I tried this test on parrotbench (b0.py in particular) and I'm not sure I
could distinguish an improvement over the noise (best case was about 5%). 
The variability is pretty high on my box (dual amd64 opertons, ubuntu gcc
4.1.2-ish).  At first it seemed a bit slower with the original patch which
uses unsigned ints.  I tried changing to unsigned longs.  It seemed a
little better, though not sure if it was really due to the change.  I think
unsigned longs should be used for 64-bit boxes.

Did you use a benchmark/program that is open source?  I don't know that I
have anything decent to test this with.  Raymond probably does though. 
Also what platform did you test on?

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