[pypy-issue] [issue1297] performance regression from 1.7 to 1.8/1.9

[Steve Clift]

New submission from Steve Clift <Steve.Clift at L-3Com.com>:

I'm seeing a strange performance regression with 1.8/1.9. The Python program 
does a lot of bit fiddling, unpacking inconveniently formatted binary data from 
a file. Timing, using Ubuntu 8.04 on a Dell Latitude E6400:

python-2.5.2:                              6.7 secs
pypy-1.7:                                  1.7
pypy-1.9:                                 13.0 (same with 1.8 IIRC)
pypy-1.9 --jit off:                        9.0
pypy-1.9 running program through cProfile: 7.0!

Has anyone else seen anything like this, or do I need to explore further to try 
to isolate the problem?

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messages: 4882
nosy: pypy-issue, sclift
priority: bug
status: unread
title: performance regression from 1.7 to 1.8/1.9

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PyPy bug tracker <tracker at bugs.pypy.org>
<https://bugs.pypy.org/issue1297>
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