Le Mardi 25 Octobre 2011 10:44:16 Stefan Behnel a écrit :
> Richard Saunders, 25.10.2011 01:17:
> > -On [20111024 09:22], Stefan Behnel wrote:
> > >>I agree. Given that the analysis shows that the libc memcmp() is
> > >>particularly fast on many Linux systems, it should be up to the
> > >>Pyt
Richard Saunders, 25.10.2011 01:17:
-On [20111024 09:22], Stefan Behnel wrote:
>>I agree. Given that the analysis shows that the libc memcmp() is
>>particularly fast on many Linux systems, it should be up to the Python
>>package maintainers for these systems to set that option externally th
-On [20111024 09:22], Stefan Behnel (stefan...@behnel.de) wrote:>>I agree. Given that the analysis shows that the libc memcmp() is >>particularly fast on many Linux systems, it should be up to the Python >>package maintainers for these systems to set that option externally through >>the optimisatio
-On [20111024 09:22], Stefan Behnel (stefan...@behnel.de) wrote:
>I agree. Given that the analysis shows that the libc memcmp() is
>particularly fast on many Linux systems, it should be up to the Python
>package maintainers for these systems to set that option externally through
>the optimisatio
"Martin v. Löwis", 23.10.2011 23:44:
I am still rooting for -fno-builtin-memcmp in both Python 2.7 and 3.3 ...
(after we put memcmp in unicode_compare)
-1. We shouldn't do anything about this. Python has the tradition of not
working around platform bugs, except if the work-arounds are necessary
> I am still rooting for -fno-builtin-memcmp in both Python 2.7 and 3.3 ...
> (after we put memcmp in unicode_compare)
-1. We shouldn't do anything about this. Python has the tradition of not
working around platform bugs, except if the work-arounds are necessary
to make something work at all - i.e
On Fri, 21 Oct 2011 18:23:24 + (GMT)
Richard Saunders wrote:
>
> If both loops are the same unicode kind, we can add memcmp
> to unicode_compare for an optimization:
>
> Py_ssize_t len = (len1
> /* use memcmp if both the same kind */
> if (kind1==kind2) {
> int result=me
Richard Saunders, 21.10.2011 20:23:
As long as the two strings are the same unicode "kind", you can use a
memcmp to compare. In that case, I would almost argue some memcmp
optimization is even more important: unicode strings are potentially 2
to 4 times larger, so the amount of time spent in memc
>>> Richard Saunders>>> I have been doing some performance experiments with memcmp, and I was>>> surprised that memcmp wasn't faster than it was in Python. I did a whole,>>> long analysis and came up with some very simple results.Antoine Pitrou, 20.10.2011 23:08:>> Thanks for the analysis. Non-
On Fri, 21 Oct 2011 08:24:44 +0200
Stefan Behnel wrote:
> Antoine Pitrou, 20.10.2011 23:08:
> >> I have been doing some performance experiments with memcmp, and I was
> >> surprised that memcmp wasn't faster than it was in Python. I did a whole,
> >> long analysis and came up with some very simpl
Antoine Pitrou, 20.10.2011 23:08:
I have been doing some performance experiments with memcmp, and I was
surprised that memcmp wasn't faster than it was in Python. I did a whole,
long analysis and came up with some very simple results.
Thanks for the analysis. Non-bugfix work now happens on Pyt
Hey,> I have been doing some performance experiments with memcmp, and I was> surprised that memcmp wasn't faster than it was in Python. I did a whole, > long analysis and came up with some very simple results.Paul Svensson suggested I post as much as I can as text, as people would be more likely t
On 10/20/2011 5:08 PM, Antoine Pitrou wrote:
> Have you reported gcc's "outdated optimization" issue to them? Or is it
> already solved in newer gcc versions?
I checked this on gcc 4.6, and it still optimizes memcmp/strcmp into a
"repz cmpsb" instruction on x86. This has been known to be a problem
Hello,
> I have been doing some performance experiments with memcmp, and I was
> surprised that memcmp wasn't faster than it was in Python. I did a whole,
> long analysis and came up with some very simple results.
>
> Before I put in a tracker bug report, I wanted to present my findings
> and
Hi,This is my first time on Python-dev, so I apologize for my newbie-ness.I have been doing some performance experiments with memcmp, and I wassurprised that memcmp wasn't faster than it was in Python. I did a whole, long analysis and came up with some very simple results.Before I put in a tracker
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