[vtkusers] unable to write multiple .pvtu files with split vtkMPIController

[Joan Baiges]

Hello,
I am trying to write several .vtu and .pvtu files by using several
MPI_Communicators. For this, I Splitinitialize a vtkMPIController object,
and then set this controller as the controller for a
vtkXMLPUnstructuredGridWriter.

However, when I ask the vtkXMLPUnstructuredGridWriter->Write(), only one
.pvtu file is written, while I would expect that one .pvtu file is written
for each of the communicators the MPI_COMM_WORLD has been subdivided into.
On the other hand, the .vtu files are written properly for all the
processors in all the split mpi controllers.

The code I am writing looks approximately like this:

vtkMPIController* controller;
vtkMPICommunicator* communicator;
vtkSmartPointer<vtkUnstructuredGrid> unstructuredGrid;
vtkSmartPointer<vtkXMLPUnstructuredGridWriter> parallelwriter;

//New communicator and spliting of the communicator
communicator = vtkMPICommunicator::New();
communicator = vtkMPICommunicator::GetWorldCommunicator();
communicator->SplitInitialize(communicator,MulticommColor,MPIrank);

//Setting the split communicator as the communicator for the controller
 controller = vtkMPIController::New();
 controller->SetCommunicator(communicator);
 controller->Initialize();
 controller->SetGlobalController(controller);

//Initializing the parallelwriter with the controller
parallelwriter = vtkSmartPointer<vtkXMLPUnstructuredGridWriter>::New();
   parallelwriter->SetController(controller);
   parallelwriter->SetNumberOfPieces(MPIsize);
   parallelwriter->SetGhostLevel(1);
   parallelwriter->SetStartPiece(MPIrank);
   parallelwriter->SetEndPiece(MPIrank);

//setting file name
fname = std::string(filename);
fname.append(".pvtu");
parallelwriter->SetFileName(fname.c_str());


//Setting the grid
unstructuredGrid = vtkSmartPointer<vtkUnstructuredGrid>::New();
parallelwriter->SetInputData(unstructuredGrid);


//After writing the grid info, we call the parallelwriter to write
parallelwriter->Write();

This final line causes all the processors to write the .vtu files, however
only one processor writes the .pvtu file, while I would expect/like one
.pvtu file per split mpi communicator.

Thank you in advance for your help,

Joan
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