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

[VAUTRIN Yohann (SAFRAN)]

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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