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Re: Opinions on packaging ATLAS (for the x86 architecture)



On Friday, 25 September 2009 at 16:50, Chris Adams wrote:
> Once upon a time, Deji Akingunola <dakingun gmail com> said:
> > I am trying to decide
> > which variant to provide as the default one that would be picked to
> > satisfy atlas library dependency out of the following 2 possibilities;
> 
> Isn't there a way to have run-time choosing of which variant to use,
> based on running CPU functionality?  I know glibc (or is it ld.so) can
> do some level of load-time choosing of optimized libraries based on CPU
> features.

There is, but it's not documented. AFAIR, Fedora's glibc does not make
use of libraries placed in %{_libdir}/{sse,sse2} automatically (which
would solve 2/3rds of this problem), but does make use of libraries
placed in %{_libdir}/i686, which doesn't solve our problem at all.

IIRC, Debian's glibc does use sse and sse2 subdirectories. Maybe our
glibc could be patched to do that as well.

Regards,
R.

-- 
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