[Numpy-discussion] building numpy with atlas on ubuntu edgy

Keith Goodman kwgoodman@gmail....
Wed Apr 18 12:17:34 CDT 2007

On 4/18/07, Charles R Harris <charlesr.harris@gmail.com> wrote:
> On 4/18/07, Keith Goodman <kwgoodman@gmail.com> wrote:
> > I'd like to compile atlas so that I can take full advantage of my core
> > 2 duo. Numpy dynamically links to the debian binary of atlas-sse that
> > I installed. But the atlas website says that they recommend static
> > linking.
> >
> > Which do you recommend, static or dynamic? Are there good directions for
> either?
> I don't know which is best, although I suspect the statically linked version
> will be larger. It might seem that just pulling in the gemm routines
> wouldn't add much, but they pull in lots of supporting routines. To get
> numpy to link statically you will also probably need to have a directory
> that contains only the *.a versions because the linker will default to the
> *.so if they are present; i don't think there is a way to specify the
> -static flag to the gcc compiler. Maybe someone else knows how to do that.
> For ATLAS, I believe the latest versions are also recommended because the
> stable version is so old.

At the moment best is equal to easiest since I have never compiled
atlas. Does anyone know of a howto on compiling atlas (dynamically

Besides speed I'm also interested in seeing if I can get rid of the
repeatability problems I have with the debian atlas-sse2 binary.
(Repeated calulations, as discuss on this list, give give difference
results in numpy but not octave.)

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