[Paraview] pvpython vtkMPIController usage? rank is always 0

[David E DeMarle]

Try your script within pvbatch.

pvpython is analogous to the Qt client application, it (usually) is not
part of an MPI execution environment. Either one can connect to an MPI
parallel pvserver.
pvbatch is a python interface that is meant to be run on the server. It is
directly connected to the pvserver.






David E DeMarle
Kitware, Inc.
Principal Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Tue, May 16, 2017 at 1:07 PM, Ephraim Obermaier <
ephraimobermaier at gmail.com> wrote:

> Hello,
> I am trying to use VTK's MPI communication from pvpython, running with
> OpenMPI's mpirun. It seems like ParaView hasn't enabled the MPI
> capabilities for VTK, although it was compiled from source with
> PARAVIEW_USE_MPI=ON and correctly found the system OpenMPI-2.0.0 libraries
> and includes.
>
> I am running the short example below with the command "mpirun -n 2
> pvpython test.py". The full output is also attached.
> In short, both MPI processes report rank=0 and size=1 and their controller
> is a vtkDummyController although I expected rank=0..1, size=2 and a
> vtkMPIController.
>
> Is it possible to determine the problem with the given information? Do I
> need extra CMake settings besides "PARAVIEW_USE_MPI=ON" to enable MPI for
> VTK?
> ParaView by itself runs fine in parallel, and I can start several parallel
> pvservers using "mpirun -n 16 pvserver".
>
> --- test.py: ---
> import vtk
>
> c = vtk.vtkMultiProcessController.GetGlobalController()
>
> print "comm:",type(c)
> rank = c.GetLocalProcessId()
> print "rank:",rank
> size = c.GetNumberOfProcesses()
> print "size:",size
>
> if rank == 0:
>     ssource = vtk.vtkSphereSource()
>     ssource.Update()
>     print " 0 sending."
>     c.Send(ssource.GetOutput(), 1, 1234)
> else:
>     sphere = vtk.vtkPolyData()
>     print " 1 receiving."
>     c.Receive(sphere, 0, 1234)
>     print sphere
>
> --- Test run: ---
> $ mpirun -n 2 pvpython test.py
> comm: <type 'vtkParallelCorePython.vtkDummyController'>
> rank: 0
> size: 1
>  0 sending.
> Warning: In /home/user/.local/easybuild/build/ParaView/5.3.0/foss-
> 2016b-mpi/ParaView-v5.3.0/VTK/Parallel/Core/vtkDummyCommunicator.h, line
> 47
> vtkDummyCommunicator (0x1ff74e0): There is no one to send to.
> [... 7 more times the same Warning...]
>
> comm: <type 'vtkParallelCorePython.vtkDummyController'>
> rank: 0
> size: 1
>  0 sending.
> Warning: In /home/user/.local/easybuild/build/ParaView/5.3.0/foss-
> 2016b-mpi/ParaView-v5.3.0/VTK/Parallel/Core/vtkDummyCommunicator.h, line
> 47
> vtkDummyCommunicator (0x22c14e0): There is no one to send to.
> [... 7 more times the same Warning...]
> --- end of output ---
>
> Thank you!
> Ephraim
>
>
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