[Numpy-discussion] Different results from repeated calculation

Charles R Harris charlesr.harris@gmail....
Thu Feb 1 22:07:50 CST 2007


On 1/28/07, Keith Goodman <kwgoodman@gmail.com> wrote:
>
> On 1/27/07, Keith Goodman <kwgoodman@gmail.com> wrote:
> > On 1/27/07, Fernando Perez <fperez.net@gmail.com> wrote:
> > > It's definitely looking like something SMP related: on my laptop, with
> > > everything other than the hardware being identical (Linux distro,
> > > kernel, numpy build, etc), I can't make it fail no matter how I muck
> > > with it.  I always get '0 differences'.
> > >
> > > The desktop is a dual-core AMD Athlon as indicated before, the laptop
> > > is an oldie Pentium III.  They both run the same SMP-aware Ubuntu i686
> > > kernel, since Ubuntu now ships a unified kernel, though obviously on
> > > the laptop the SMP code isn't active.
> >
> > After installing a kernel that is not smp aware, I still have the same
> problem.
>
> The problem goes away if I remove atlas (atlas3-sse2 for me). But that
> just introduces another problem: slowness.


This problem may be related to this bug:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=279294

Chuck
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