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[Octave-bug-tracker] [bug #60762] Repeatable crash on exit when OPENBLAS
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From: |
anonymous |
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Subject: |
[Octave-bug-tracker] [bug #60762] Repeatable crash on exit when OPENBLAS_NUM_THREADS is set to 6 |
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Date: |
Thu, 10 Jun 2021 14:15:19 -0400 (EDT) |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:89.0) Gecko/20100101 Firefox/89.0 |
Follow-up Comment #4, bug #60762 (project octave):
I think I found the problem. Quoting from here:
https://github.com/xianyi/OpenBLAS
The priorities are OPENBLAS_NUM_THREADS > GOTO_NUM_THREADS > OMP_NUM_THREADS.
If you compile this library with USE_OPENMP=1, you should set the
OMP_NUM_THREADS environment variable; OpenBLAS ignores OPENBLAS_NUM_THREADS
and GOTO_NUM_THREADS when compiled with USE_OPENMP=1.
The distro sets OpenBlas to build using USE_OPENMP=1, and tuning
OMP_NUM_THREADS before calling Octave has a 20% difference in performance
without crashing but changing OPENBLAS_NUM_THREADS on a library built with
USE_OPENMP=1 causes a crash.
Either way, Octave itself is not affected by this OpenBlas library behavior.
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