[petsc-dev] OpenMP

[Junchao Zhang]

On Sat, Nov 6, 2021 at 5:51 AM Mark Adams <mfadams at lbl.gov> wrote:

> Two questions on OMP:
>
> * Can I test for the version of OMP? I want >= 5 and I see this, which
> looks promising:
> include/petscsys.h:#elif defined(_OPENMP) && *_OPENMP >= 201307* &&
> !defined(_WIN32)
>
> * What is the difference between HAVE_OPENMP and
> HAVE_OPENMP_SUPPORT.
>
> # this is different from HAVE_OPENMP. HAVE_OPENMP_SUPPORT checks if we
have facilities to support
# running PETSc in flat-MPI mode and third party libraries in MPI+OpenMP
hybrid mode
if self.mpi.found and self.mpi.support_mpi3_shm and self.pthread.found and
self.hwloc.found:
# Apple pthread does not provide this functionality
if self.function.check('pthread_barrier_init', libraries = 'pthread'):
self.addDefine('HAVE_OPENMP_SUPPORT', 1)


> Thanks,
> Mark
>
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