[Dune] Assertion error when running Dune greed in parallel

[Jö Fahlke]

Am Fr,  5. Jul 2019, 12:28:51 +0000 schrieb Guichard, Roland:
> I see thanks.
> A quick question though, does it mean that there are several MPI initializations possible within Dune and the communicator that needs to be passed to the GridPtr (from dune-fem) is responsible for handling the mesh in parallel ?

MPI_Init is only ever called once.

Though it is up to the grid manager implementation which MPI communicators are
supported.  Some managers may implicitly assume MPI_COMM_WORLD, others may not
support MPI at all (which is implicitly equivalent to MPI_COMM_SELF).

For yet others it may be possible to specify the communicator when
constructing the grid.  So if you obtained that communicator by splitting
MPI_COMM_WORLD into two subsets of nodes, you will end up with two independent
grids, each operating within one of the subsets.

Regards,
Jö.

-- 
Jorrit (Jö) Fahlke, Institute for Computational und Applied Mathematics,
University of Münster, Orleans-Ring 10, D-48149 Münster
Tel: +49 251 83 35146 Fax: +49 251 83 32729

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