Pjotr Prins <pjotr.publi...@thebird.nl> skribis: > On Wed, Dec 20, 2017 at 07:15:16PM +0100, Ricardo Wurmus wrote:
[...] >> The FAQ document[1] says this: >> >> The environment variable which control the kernel selection is >> OPENBLAS_CORETYPE (see driver/others/dynamic.c) e.g. export >> OPENBLAS_CORETYPE=Haswell. And the function char* >> openblas_get_corename() returns the used target. >> >> [1]: https://github.com/xianyi/OpenBLAS/wiki/Faq >> >> Have you tried this and compared the performance? > > About 10x difference on 24+ cores for matrix multiplication (my > version vs what comes with Guix). Even when you use OPENBLAS_CORETYPE=haswell (lower-case?)? That would be surprising: it’s the same code after all. The only difference should be what happens at load time. Ludo’.
