[Python-Dev] 2.7 is here until 2020, please don't call it a waste.

M.-A. Lemburg mal at egenix.com
Mon Jun 1 13:14:27 CEST 2015

On 01.06.2015 12:44, Armin Rigo wrote:
> Hi Larry,
> On 31 May 2015 at 01:20, Larry Hastings <larry at hastings.org> wrote:
>> p.s. Supporting this patch also helps cut into PyPy's reported performance
>> lead--that is, if they ever upgrade speed.pypy.org from comparing against
>> Python *2.7.2*.
> Right, we should do this upgrade when 2.7.11 is out.
> There is some irony in your comment which seems to imply "PyPy is
> cheating by comparing with an old Python 2.7.2": it is inside a thread
> which started because "we didn't backport performance improvements to
> 2.7.x so far".
> Just to convince myself, I just ran a performance comparison.  I ran
> the same benchmark suite as speed.pypy.org, with 2.7.2 against 2.7.10,
> both freshly compiled with no "configure" options at all.  The
> differences are usually in the noise, but range from +5% to... -60%.
> If anything, this seems to show that CPython should take more care
> about performance regressions.  If someone is interested:
> * "raytrace-simple" is 1.19 times slower
> * "bm_mako" is 1.29 times slower
> * "spitfire_cstringio" is 1.60 times slower
> * a number of other benchmarks are around 1.08.
> The "7.0x faster" number on speed.pypy.org would be significantly
> *higher* if we upgraded the baseline to 2.7.10 now.

If someone were to volunteer to set up and run speed.python.org,
I think we could add some additional focus on performance
regressions. Right now, we don't have any way of reliably
and reproducibly testing Python performance.

Hint: The PSF would most likely fund such adventures :-)

Marc-Andre Lemburg

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