[Paraview] [Catalyst] Setting the MPI Comm in Python

[Andy Bauer]

Hi,

Can you use a different controller that has the same MPI processes assigned
to it? If that works for you, you should be able to just create a
vtkMPIController and use either CreateSubController() or
PartitionController() to create one similar to what you want. Note that you
may need to create two vtkMPIControllers, one that corresponds to
MPI_COMM_WORLD and one for your partitioning. After you've done that you
can use the vtkMPIController::SetGlobalController() to have VTK and
ParaView use that for interprocess communication.

Best,
Andy

On Fri, Feb 26, 2016 at 10:09 AM, VAUTRIN Yohann (SAFRAN) <
yohann.vautrin at safran.fr> wrote:

> Hi,
>
>
>
> I’m working on a Catalyst adaptor written in Python for one of the CFD
> codes I use at work and I’m having trouble setting the MPI communicator I
> want the vtkCPProcessor object to use (in order to use a subset of
> MPI_COMM_WORLD). The MPI communicator I create is a mpi4py.MPI_Comm object,
> which I convert to a vtkMPICommunicator object using
> vtk.vtkMPI4PyCommunicator.ConvertToVTK. However
> vtk.vtkPVCatalystPython.vtkCPProcessor.Initialize is expecting a
> vtkMPICommunicatorOpaqueComm object and there does not seem to be a way for
> me to create such an object from the Python interface. Am I missing
> something here or is something not wrapped correctly or wrong?
>
>
>
> For the moment I use mpi4py.MPI.COMM_WORLD to test everything. The
> following minimal example replicates my problem:
>
> *import mpi4py.MPI*
>
> *import vtk*
>
> *comm = mpi4py.MPI.COMM_WORLD*
>
> *coprocessor = vtk.vtkPVCatalystPython.vtkCPProcessor()*
>
> *coprocessor.Initialize(vtk.vtkMPI4PyCommunicator.ConvertToVTK(comm))*
>
> The last line fails with this message:
>
> *TypeError: Initialize argument 1: method requires a
> vtkMPICommunicatorOpaqueComm, a vtkMPICommunicator was provided.*
>
>
>
> I hope I post on the right mailing list as this could actually be a
> problem in VTK.
>
>
>
> Thank you for your help.
>
>
>
> Best,
>
> Yohann V.
>
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