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

David Fraser davidf at sjsoft.com
Wed Jul 20 12:36:20 CEST 2011



On Wednesday, July 20, 2011 at 10:27:24 AM, Maciej Fijalkowski <fijall at gmail.com> wrote:
> 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

Fantastic, thank you...

David


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