I recently did this under Gentoo. It seems that the atlas package doesn't build a complete lapack, which is necessary. Instead I emerged the newer blas-atlas and lapack-atlas packages. These build a complete lapack library with atlas optimizations. They are however masked with ~x86 so you have to add the following to your /etc/portage/package.keywords: app-sci/lapack-atlas ~x86 app-sci/blas-atlas ~x86 app-sci/blas-config ~x86 app-sci/lapack-config ~x86 blas-config and lapack-config are packages that are needed by the other ones. They can be used to switch between reference lapack or atlas optimized libraries (if you install lapack-reference and blas-reference) For more information see Gentoo bug #30453 Hope this helps, Mats On Friday 30 July 2004 18.28, Chris Barker wrote:
David M. Cooke wrote:
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.
OK, I'm really confused now. I got it working, but it seems to have virtually identical performance to the Numeric-supplied lapack-lite.
I'm guessing that the LAPACK package I emerged does NOT use the atlas BLAS.
if the atlas liblapack doesn't have all of lapack, how in the world are you supposed to use it? I have no idea how I would get the linker to get what it can from the atlas lapack, and the rest from another one.
Has anyone done this on Gentoo? If not how about another linux distro, I don't have to use portage for this after all.
-Chris