On 06/13/2018 03:15 PM, John Peterson wrote:
On Wed, Jun 13, 2018 at 11:03 AM, Michael Povolotskyi
<mpovo...@purdue.edu <mailto:mpovo...@purdue.edu>> wrote:
Hello John,
I played with it, and this is what worked for me.
#include <vector>
#include <sstream>
using namespace std;
#define private public//to get access to
libMesh::LibMeshInit._vtk_mpi_controller
#include "libmesh/mesh_generation.h"
#include "libmesh/mesh.h"
#include "libmesh/vtk_io.h"
#include "libmesh/libmesh.h"
#include "vtkMPIController.h"
int main(int argc, char ** argv)
{
MPI_Init(&argc, &argv);
{
libMesh::LibMeshInit init (argc, argv,MPI_COMM_WORLD);
int rank;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
vtkMPICommunicator* mcomm =
vtkMPICommunicator::GetWorldCommunicator()->NewInstance ();
mcomm->SplitInitialize (mcomm, rank, 0);
init._vtk_mpi_controller->SetCommunicator (mcomm);
libMesh::Mesh
mesh(libMesh::Parallel::Communicator(MPI_COMM_SELF));
libMesh::MeshTools::Generation::build_cube (mesh,
10, 10, 5, 0.0, 2.0, 0.0, 3.0, 0.0, 4.0,libMesh::HEX8);
if (rank == 0)
{
libMesh::VTKIO out(mesh);
out.write("mesh1.pvtu");
}
}
MPI_Finalize();
return 0;
}
What do you think? Can you provide an access to
libMesh::LibMeshInit._vtk_mpi_controller?
Or there is a better solution?
I think it would be reasonable to provide a public accessor for
_vtk_mpi_controller, as long as we can still get away with a forward
declaration for vtkMPIController.
Would it be possible to do the same algorithm from within
VTKIO::read()? At that point, we have a Communicator (mesh.comm()) for
the Mesh we are currently writing, so we could probably do the same
New/Split/Set series of steps there, but unfortunately we don't have
access to the LibMeshInit at that point...
--
John
Would you add the access to _vtk_mpi_controller for me?
I can do it myself, but I prefer to be consistent with you.
It looks to me that for a regular solution you need to reset the
vtkMPICommunicator before any read/write event. Can you store the
vtkMPICommunicator inside the mesh class?
Michael.
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