On Wed, Jul 1, 2020 at 12:06 PM Susi Lehtola <jussileht...@fedoraproject.org> wrote: > On Wed, 1 Jul 2020 10:54:16 -0600 > Jerry James <loganje...@gmail.com> wrote: > > openblas-serial: use if the application is multithreaded > > openblas-threads: use if the application is single-threaded > > No, this is exactly the wrong way around. You should use the serial > library for code that you want to be running in serial (this way you > can get several instances of the program running efficiently), and the > pthreads version if you want to run the BLAS/LAPACK regions in parallel > (but are somehow opposed to OpenMP!)..
Okay, I think the wiki's wording is hard to understand (https://github.com/xianyi/OpenBLAS/wiki/faq#multi-threaded), at least for me. Let me see if I've got this straight. 1. openblas-opemp computes on subranges in parallel using OpenMP 2. openblas-threads computes on subranges in parallel using pthreads 3. openblas-serial uses a single thread for the entire computation Right? What I'm looking for is a set of rules I can apply when I've got a package that uses BLAS, but upstream has given no guidance on what kind of BLAS library is suitable. I've got several of those, so I want to check that they're linking with the best version of the library. How should I make that determination? Also, how do I know whether to use, say, openblas-openmp vs. openblas-openmp64 vs. openblas-openmp64_? -- Jerry James http://www.jamezone.org/ _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
