[Octave-bug-tracker] [bug #51643] setting OMP_NUM_THREADS at runtime does not chaneg number of openmp threads

[Carnë Draug]

URL:
  <http://savannah.gnu.org/bugs/?51643>

                 Summary: setting OMP_NUM_THREADS at runtime does not chaneg
number of openmp threads
                 Project: GNU Octave
            Submitted by: carandraug
            Submitted on: Wed 02 Aug 2017 06:55:07 PM UTC
                Category: None
                Severity: 1 - Wish
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

The multiple threads of an openmp program are typically initialised at the
start of that program based on the OMP_NUM_THREADS variable. Changing that
variable at runtime does not change the number of threads, there's a C++
function 'omp_set_num_threads' for that.

Would be nice to configure this from Octave. Since nproc already documents
that the environment variable OMP_NUM_THREADS is used, I guess that maybe
setenv could check if OMP_NUM_THREADS is being changed and call the
appropriate omp function.




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