[Numpy-discussion] Different results from repeated calculation

Keith Goodman kwgoodman at gmail.com
Sun Jan 28 09:40:05 CST 2007


On 1/27/07, Keith Goodman <kwgoodman at gmail.com> wrote:
> On 1/27/07, Fernando Perez <fperez.net at 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.

So is this something to report to Clint Whaley? Or does it have to do
with how numpy uses atlas?


More information about the Numpy-discussion mailing list