[Octave-bug-tracker] [bug #48535] nproc ("overridable") ignores nesting level

[Oliver Heimlich]

URL:
  <http://savannah.gnu.org/bugs/?48535>

                 Summary: nproc ("overridable") ignores nesting level
                 Project: GNU Octave
            Submitted by: oheim
            Submitted on: Sat 16 Jul 2016 11:37:03 PM CEST
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Oliver Heimlich
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

nproc ("overridable") parses the environment variable OMP_NUM_THREADS for an
integer. However, according to OpenMP documentation it may be a list of
integers. In that case, nproc ("overridable") ignores the value of
OMP_NUM_THREADS. See
https://gcc.gnu.org/onlinedocs/libgomp/OMP_005fNUM_005fTHREADS.html

What I get:

$ OMP_NUM_THREADS=2,2 octave --eval 'nproc ("overridable")'
ans =  4


What I expected:

$ OMP_NUM_THREADS=2,2 octave --eval 'nproc ("overridable")'
ans =  2


The bug is located in gnulib.




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