[Paraview] pvpython vtkMPIController usage? rank is always 0

[Ephraim Obermaier]

Thank you all for suggesting "pvbatch --mpi".
At least, this returns size=2 processes, but the updated test.py (below)
hangs with the following output:

$ mpirun -n 2 pvbatch --mpi test.py
comm: <type 'vtkParallelMPIPython.vtkMPIController'>
rank: 0
size: 2
Process 0

Why is "Process 1" not printed, and why does the program hang instead of
finishing?
The file test.py was simplified to:

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:
  print "Process 0"
else:
  print "Process 1"
c.Finalize()

Thank you!
Ephraim



2017-05-16 19:11 GMT+02:00 David E DeMarle <dave.demarle at kitware.com>:

> 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 <(518)%20881-4909>
>
> 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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