[Numpy-discussion] performance matrix multiplication vs. matlab

[Chris Colbert]

I'll caution anyone from using Atlas from the repos in Ubuntu 9.04  as the
package is broken:

https://bugs.launchpad.net/ubuntu/+source/atlas/+bug/363510


just build Atlas yourself, you get better performance AND threading.
Building it is not the nightmare it sounds like. I think i've done it a
total of four times now, both 32-bit and 64-bit builds.

If you need help with it,  just email me off list.

Cheers,

Chris

On Fri, Jun 5, 2009 at 2:46 PM, Matthieu Brucher <matthieu.brucher at gmail.com
> wrote:

> 2009/6/5 David Cournapeau <david at ar.media.kyoto-u.ac.jp>:
> > Eric Firing wrote:
> >>
> >> David,
> >>
> >> The eigen web site indicates that eigen achieves high performance
> >> without all the compilation difficulty of atlas.  Does eigen have enough
> >> functionality to replace atlas in numpy?
> >
> > No, eigen does not provide a (complete) BLAS/LAPACK interface. I don't
> > know if that's even a goal of eigen (it started as a project for KDE, to
> > support high performance core computations for things like spreadsheet
> > and co).
> >
> > But even then, it would be a huge undertaking. For all its flaws, LAPACK
> > is old, tested code, with a very stable language (F77). Eigen is:
> >    - not mature.
> >    - heavily expression-template-based C++, meaning compilation takes
> > ages + esoteric, impossible to decypher compilation errors. We have
> > enough build problems already :)
> >    - SSE dependency harcoded, since it is setup at build time. That's
> > going backward IMHO - I would rather see a numpy/scipy which can load
> > the optimized code at runtime.
>
> I would add that it relies on C++ compiler extensions (the restrict
> keyword) as does blitz. You unfortunately can't expect every compiler
> to support it unless the C++ committee finally adds it to the
> standard.
>
> Matthieu
> --
> Information System Engineer, Ph.D.
> Website: http://matthieu-brucher.developpez.com/
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> LinkedIn: http://www.linkedin.com/in/matthieubrucher
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