Gentoo Archives: gentoo-science

From: Darren Dale <dd55@×××××××.edu>
To: gentoo-science@l.g.o
Subject: Re: [gentoo-science] lapack transition
Date: Sun, 21 Aug 2005 15:32:40
Message-Id: 200508211131.16660.dd55@cornell.edu
In Reply to: Re: [gentoo-science] lapack transition by Peter Bienstman
On Sunday 21 August 2005 10:56 am, Peter Bienstman wrote:
> On Sunday 21 August 2005 16:33, Darren Dale wrote: > > On Sunday 21 August 2005 10:25 am, Peter Bienstman wrote: > > > On Sunday 21 August 2005 15:22, Darren Dale wrote: > > > > I use numeric and scipy, and have been trying for a long time to > > > > improve the ebuilds to use blas/lapack/atlas. I submitted an ebuild > > > > for numeric six months ago > > > > (http://bugs.gentoo.org/show_bug.cgi?id=81520), but it has languished > > > > in buzilla because it is not clear how to deal with ATLAS (my atlas > > > > USE flag was rejected). How should ATLAS dependencies be handled in > > > > the new infrastructure? > > > > > > In theory it's as simple as depending on virtual/blas and > > > virtual/lapack. The user can then switch between different lapack and > > > blas > > > implementations at runtime with blas-config and lapack-config. > > > > It is not that simple. If numeric and scipy are to make use of atlas, > > atlas has to be in their external library list at compile time. If atlas > > is in the list, but not installed on the system, compilation will fail. > > That's why I said 'in theory' ;-) > > I'm currently working on a patch which just ignores any explicit atlas > stuff at build time of SciPy. The idea is to build a library which simply > links to /usr/lib/liblapack.so. SciPy doesn't need to know this is a > symlink to /usr/lib/lapack/atlas/liblapack.so or any other implementation.
If you install lapack-atlas and blas-atlas, and link scipy to the blas and lapack libraries but not the atlas libraries, do you still get the enhanced performance from atlas? (This isn't a rhetorical question, I'm still learning.) If so, great, if not, is there any point to providing the lapack-atlas and blas-atlas ebuilds? On a related topic, I noticed that sci-libs/atlas is still being developed, isn't it deprecated? This ebuild installs its libraries in /usr/lib, instead of somewhere unique and providing symlinks in /usr/lib. Darren -- gentoo-science@g.o mailing list

Replies

Subject Author
Re: [gentoo-science] lapack transition Peter Bienstman <pbienst@g.o>