[Octave-bug-tracker] [bug #61208] [MXE Octave] Start scripts should set OPENBLAS_NUM_THREADS

[Markus Mützel]

URL:
  <https://savannah.gnu.org/bugs/?61208>

                 Summary: [MXE Octave] Start scripts should set
OPENBLAS_NUM_THREADS
                 Project: GNU Octave
            Submitted by: mmuetzel
            Submitted on: Thu 23 Sep 2021 02:17:07 PM CEST
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: Microsoft Windows

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Details:

OpenBLAS seems to make errors and run less performant if the number of threads
it uses exceeds the number of physical processor cores.
That seems to happen with default settings on machines with processor that use
hyperthreading.
See also some posts interleaved in that discourse thread. E.g.:
https://octave.discourse.group/t/release-candidate-available/1227/21
https://octave.discourse.group/t/release-candidate-available/1227/117

I'll post a possible patch for the start scripts included in the Windows
bundle created with MXE Octave as soon as I have a bug number.




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