[Bug 739398] Review Request: openblas - An optimized BLAS library based on GotoBLAS2

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Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=739398

--- Comment #26 from Susi Lehtola <susi.lehtola@xxxxxx> ---
Coming from a high-performance computing background, I just listed the reasons
above in comment #24.

Even the environment modules solution is really a pain in the ass, since what
the environment module should really be doing is just making a dummy wrapper
available that exports the libopenblas.so soname, but actually is just calling
the functions from libopenblaso (or libopenblasp). This way SMP programs can
still be using the SMP version.

IMNSHO if people don't have any idea of what they are doing, then they are free
to link either against the serial, the pthreaded or the OpenMP version.

However, it really means a lot to be able to run serial programs in serial mode
and parallel programs in parallel mode. This package is going to be used on a
lot of computer clusters, where jobs are allocated a set amount of processors.
Then, if a serial program that for some reason uses a parallel library is run,
it can severely mess up the load balancing of said cluster. Most importantly,
MPI jobs will be often totally stuck waiting on the one node where a single
process is not playing nicely.

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