[Paraview] pvpython vtkMPIController usage? rank is always 0

[Andy Bauer]

Note that you can run both the ParaView GUI and  pvpython with MPI in order
to initialize, finalize and use MPI functions but as Dave said, they
should/will always be run with a single MPI process. The argument to run
MPI with either is "--mpi".

On Tue, May 16, 2017 at 1:11 PM, David E DeMarle <dave.demarle at kitware.com>
wrote:

> 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
>>
>>
>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virenfrei.
>> www.avast.com
>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
>> <#m_-1876715506680916602_m_7351775176557461903_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>>
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the ParaView Wiki at:
>> http://paraview.org/Wiki/ParaView
>>
>> Search the list archives at: http://markmail.org/search/?q=ParaView
>>
>> Follow this link to subscribe/unsubscribe:
>> http://public.kitware.com/mailman/listinfo/paraview
>>
>>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/
> opensource/opensource.html
>
> Please keep messages on-topic and check the ParaView Wiki at:
> http://paraview.org/Wiki/ParaView
>
> Search the list archives at: http://markmail.org/search/?q=ParaView
>
> Follow this link to subscribe/unsubscribe:
> http://public.kitware.com/mailman/listinfo/paraview
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/paraview/attachments/20170516/eea5add3/attachment.html>