[Octave-bug-tracker] [bug #45208] mxe-octave: compile with OpenBLAS with LAPACK enabled

[Ceral Paquet]

URL:
  <http://savannah.gnu.org/bugs/?45208>

                 Summary: mxe-octave: compile with OpenBLAS with LAPACK
enabled
                 Project: GNU Octave
            Submitted by: octavebugs
            Submitted on: Fri 29 May 2015 02:01:57 AM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.0-rc4
        Operating System: GNU/Linux

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Details:

I noticed with some linear algebra methods that only 1 of my CPU cores was
being used despite using Openblas and specifiying export
OPENBLAS_NUM_THREADS=2.

A'*A uses both cores but chol, svd do not. Openblas provides some of these
LAPACK functions.

I ran a little test with chol and svd and noticed they both run about 1.5
times faster with NO_LAPACK=0 in src/openblas.mk - both CPUs are used rather
than only 1 when NO_LAPACK=1. I can't think of a downside.





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