[Octave-bug-tracker] [bug #61246] matrix inversions give wrong results (inv, lu, mldivide)

[Markus Mützel]

Follow-up Comment #23, bug #61246 (project octave):

@Dmitri: I'm not sure what openblas-mpi is. Is it the same or similar to
openblas-openmp?

If I understand their documentation correctly, they advice to not use
multithreaded OpenBLAS in a multithreaded application iff OpenBLAS is called
from multiple threads of that application. Alternatively, they advice to use
OpenMP for multithreading the main application *and* OpenBLAS to be able to
set a reasonable limit for the *total* number of threads.

Afaict, that doesn't apply to us because we use OpenBLAS only in the
interpreter thread.

I still don't understand the difference in results between the official
installer and the builds from octave.space. If it is a bug in OpenBLAS, why
does it only manifest depending on the build system?

It's probably best if jwe could build a release candidate and affected people
could check if they still see the errors.


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