[pypy-dev] PyPy is much slower than CPython example / question

Maciej Fijalkowski fijall at gmail.com
Wed Jul 20 10:27:24 CEST 2011


On Wed, Jul 20, 2011 at 9:25 AM, David Fraser <davidf at sjsoft.com> wrote:
>
>
> On Wednesday, July 20, 2011, at 8:50:20 AM, "Alexander Petrov" <alexandervpetrov at gmail.com> wrote:
>> [snip]
>> So at this time I didn't come to some kind of decision about PyPy.
>>
>> On one hand in most of the cases with straitforward code/algorithms
>> and "common" syntax constructs there was significant speed
>> improvement.
>>
>> But on the other hand, for the cases where source Python code was
>> "optimized" or "hacked" the time of execution was sometimes better,
>> sometimes of one order... and sometimes was a cause for this topic
>> discussion. :) It is not bad thing generally, the bad thing that this
>> speed degradation situations are happenned unexpectedly for me. IMO
>> they are the most (and may be only one) interesting from the
>> PyPy-user
>> viewpoint. "Where and in what cases one can expect bottlenecks". Is
>> there any documented collection of such artifacts? It can be
>> exceptionally useful.
>
> That's exactly what I would like. I also experimented with some simple tests and came out with PyPy being twice as slow as CPython - a wiki page which documents current areas of slowness, and potential workarounds would be fantastic - I know these things can be improved in the future, sometimes quickly, but it seems like the know-how about handling it in the mean time isn't written down anywhere...
>
> David

https://bitbucket.org/pypy/pypy/wiki/JitFriendliness


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