[Numpy-discussion] Different results from repeated calculation

Sebastian Haase seb.haase@gmx....
Fri Feb 16 15:51:17 CST 2007


On 2/16/07, Keith Goodman <kwgoodman@gmail.com> wrote:
> On 2/15/07, Sebastian Haase <haase@msg.ucsf.edu> wrote:
> > On 2/15/07, Keith Goodman <kwgoodman@gmail.com> wrote:
> > > On 2/15/07, Keith Goodman <kwgoodman@gmail.com> wrote:
> > > > I built a new computer: Core 2 Duo 32-bit Debian etch with numpy
> > > > 1.0.2.dev3546. The repeatability test still fails. In order to make my
> > > > calculations repeatable I'll have to remove ATLAS. That really slows
> > > > things down.
> > >
> > > Hey, I have no problem with atlas-base and atlas-sse! On my old debian
> > > box all versions of atlas fail the repeatability test.
> >
> > You mean on the Core 2 Dua 32-bit only atlas-sse2 causes troubles ?
> > How does the speed compare atlas-sse2 vs. atlas-see (ignoring the
> > repeatablity problem)?
>
> Yes. On my old computer (P4) all three (atlas-base, -sse, -sse2) cause
> problems. On my new computer only sse2 causes a problem.
>
> I only want to know about the speed difference (sse, sse2) if the
> difference is small.

I was just wondering what generally the speed improvement from sse to sse2 is ?
Any tentative number would be fine...
-S.


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