[Numpy-discussion] Building Numeric with a native blas ?

David M. Cooke cookedm at physics.mcmaster.ca
Thu Jul 29 19:53:10 CDT 2004

On Thu, Jul 29, 2004 at 03:36:58PM -0700, Chris Barker wrote:
> Stephen Walton wrote:
> >>>one has to merge an LAPACK library built separately with the one
> >>>generated by ATLAS to get a 'complete' LAPACK.
> >>
> >>I'll try this, but it's odd that it didn't give an error when compiling 
> >>or linking.
> OK. I did an "emerge lapack" and got lapack installed, then re-build 
> Numeric, and now it works. What's odd is that before I installed lapack 
> all the libs were there, including liblapack. Anyway it works, so I'm happy.

Atlas might have installed a liblapack, with the (few) functions that it
overrides with faster ones. It's by no means a complete LAPACK
installation. Have a look at the difference in library sizes; a full
LAPACK is a few megs; Atlas's routines are a few hundred K.

|David M. Cooke                      http://arbutus.physics.mcmaster.ca/dmc/
|cookedm at physics.mcmaster.ca

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