Le jeudi 24 novembre 2011 à 10:27 +0100, Christoph Groth a écrit : > Hello, > > when rebuilding libatlas3gf-base (from testing) the debian way, how to > specify the number of threads to be used? How to disable threading > altogether? Did you try with -t 1 ?
> I found that on my machine (Sandy Bridge CPU) complex matrix-matrix > product (zgemm) is actually slower for large matrices with a custom > build ATLAS than with the default one. I believe the culprit is > hyperthreading: the default ATLAS uses two threads which corresponds to > the physical number of cores of my machine, while the custom-build uses > four threads, which seems not to be optimal in this case. You should report a bug upstream about that. Sylvestre -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
