[petsc-dev] OpenMP compiler options

[Matthew Knepley]

On Tue, May 29, 2012 at 3:52 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> The OpenMP flags do not definitively identify that OpenMP is used. In
> particular, IBM XL interprets Cray's option "-h omp" as being equivalent to
> "-soname omp", then silently ignores the Open MP pragmas. We can perhaps
> "fix" this instance by moving -qsmp up in the list, but we may eventually
> need to move it to compilerOptions.py.


Move it up, and add it to the comment. And people think OpenMP is the easy
way?

   Matt


>   def configureLibrary(self):
>     ''' Checks for -fopenmp compiler flag'''
>     ''' Needs to check if OpenMP actually exists and works '''
>     self.setCompilers.pushLanguage('C')
>     #
>     for flag in ["-fopenmp", # Gnu
>                  "-h omp",   # Cray
>                  "-mp",      # Portland Group
>                  "-Qopenmp", # Intel windows
>                  "-openmp",  # Intel
>                  " ",        # Empty, if compiler automatically accepts
> openmp
>                  "-xopenmp", # Sun
>                  "+Oopenmp", # HP
>                  "-qsmp",    # IBM XL C/c++
>                  "/openmp"   # Microsoft Visual Studio
>                  ]:
>       if self.setCompilers.checkCompilerFlag(flag):
>         ompflag = flag
>         break
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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