Bug#580335: Please compile multithreaded ATLAS libraries

Lucas Nussbaum lucas at lucas-nussbaum.net
Fri Jul 9 11:08:37 UTC 2010

On 09/07/10 at 11:16 +0200, Sylvestre Ledru wrote:
> Hello Ryo,
> > I have been able to link my program with threaded ATLAS successfully as:
> > 
> > $ gcc test.c -L/usr/lib/atlas-corei7sse3 -lptf77blas -latlas -lgfortran
> > 
> > However, I cannot get any speed gain on our 8-core with hyperthreading machine.
> Yes, and I guess my answer will disappoint you.
> To allow your 8 cores to be used, you must rebuild Atlas (fakeroot
> debian/rules custom).
> Unlike the MKL, the number of thread is static:
> http://math-atlas.sourceforge.net/faq.html#tnum

Couldn't we build it for, say, 16 cores and get away with it? Are there
performance implications with building it for too many cores?


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