[Dune] example for mpicollectivecommunication

[Christian Engwer]

On Wed, Oct 01, 2014 at 12:02:48PM +0200, Aleksejs Fomins wrote:
> Thank you for your replies.
> 
> So I write it like this
> 
> ------------------------------------
> Dune::CollectiveCommunication comm =
> mpihelper_.getCollectiveCommunication();

You do not instatiate CollectiveCommunication by hand, but retrieve it
from your mash (in your case from the host grid)

Christian

> int parallel_sum_elem  = comm.sum(internal_elements.size());
> ------------------------------------
> 
> and get error
> 
> error: missing template arguments before ‘comm’
> Dune::CollectiveCommunication comm =
> mpihelper_.getCollectiveCommunication();
> 
> How do how do I get the correct template argument.
> 
> I am sorry if this question is trivial, I am just not very familiar with
> the structure yet.
> 
> Regards,
> Aleksejs
> 
> 
> 
> On 10/01/2014 11:27 AM, Tobias Malkmus wrote:
> > Hi Aleksejs
> > 
> > You can use the Dune::CollectiveCommunication from
> > dune-common/dune/common/parallel/mpicollectivecommunication.hh.
> > It contains a method called sum, which does what you need.
> > 
> > Of cousre you will have to initialize the MPI communicator using:
> > 
> > MPIHelper::instance( argc, argv )
> > 
> > from dune-common/dune/common/parallel/mpihelper.hh at the beginning of
> > your main routine.
> > 
> > Don't forget to configure dune with parallel support(
> > --enable-parallel, MPICC=/.../mpicc )
> > 
> > 
> > Best Tobias
> > 
> > On 10/01/2014 11:00 AM, Aleksejs Fomins wrote:
> >> Dear Dune,
> > 
> >> I would like to sum up a variable over all processes.
> > 
> >> Could you suggest an example program I can take inspiration from?
> > 
> >> Thank you, Aleksejs
> > 
> > 
> > 
> >> _______________________________________________ Dune mailing list 
> >> Dune at dune-project.org 
> >> http://lists.dune-project.org/mailman/listinfo/dune
> > 
> > 
> > 
> > 
> 



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-- 
Prof. Dr. Christian Engwer 
Institut für Numerische und Angewandte Mathematik
Fachbereich Mathematik und Informatik der Universität Münster
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