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List:       pypy-dev
Subject:    Re: [pypy-dev] deepcopy slower in PyPy - testing script
From:       David Fraser <davidf () sjsoft ! com>
Date:       2011-09-08 13:23:26
Message-ID: 015527d4-c1f0-4149-8702-41d27f6cd300 () jackdaw ! local
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On Thursday, September 8, 2011 at 12:58:54 PM, Jorge de Jesus <jmdj@pml.ac.uk> wrote:
> Hi to all
> 
> Thank you for all the answers concerning the topic.
> 
> The deepcopy testing script in issue 767 [1], is working faster in PyPy
> than in CPython, but deepcopy is run on a list of numbers.
> 
> BUT, PyWPS runs a lot of DOM functions and deepcopy calls that pass DOM
> Elements as argument.  Just to add my 2cents, it seems that a deepcopy
> of a complexer object (compared to a number list) is slower in PyPy
> 
> I've managed to replicate the problem in a small script  [2] that is
> slower in PyPy:
> python 2.7.1+ : 0.3057 s
> pypy1.6 (jit): 1.42s
> pypy-c-1.6.svn: 1.23s
> 
> The pypy-c-1.6-svn is a compiled version from the SVN and its
> compilation options can be found here [3] . The tests were done in 32bit
> machine
> 
> Can someone give a look at the testing script and determine why is it
> slow ?!
> 
> Thank you for the support, and I must say that PyPy is an amazing
> project !!!!

I've attached a slightly modified version of your script that uses timeit to measure \
the time, and takes an argument to specify the number of repeats...

This shows that PyPy gets faster as the JIT kicks in:
python2.7      1000    0.33
python2.7      10000   0.33
python3.2      1000    0.41
python3.2      10000   0.40
pypy   1000    1.29
pypy   10000   0.22
pypy   100000  0.08

Hope that helps

David
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