[Paraview] running parallel pvservers

[David E DeMarle]

Jeff,

Have you gotten this running? //with Berk's help on the transmit*piece part?

best wishes,

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

On Wed, Aug 5, 2015 at 4:54 PM, Jeff Becker <jeffrey.c.becker at nasa.gov>
wrote:

> Hi David and list. I'm still struggling with distributing my dataset
> (bmag) across nodes. My Python Programmable source script below produces
> correct output when run on a single node.
>
> contr = vtk.vtkMultiProcessController.GetGlobalController()
> nranks = contr.GetNumberOfProcesses()
> rank = contr.GetLocalProcessId()
>
> # read in bmag data and process
>
> executive = self.GetExecutive()
> outInfo = executive.GetOutputInformation(0)
> updateExtent = [executive.UPDATE_EXTENT().Get(outInfo, i) for i in
> xrange(6)]
> imageData = self.GetOutput()
> imageData.SetExtent(updateExtent)
> myout = ns.numpy_to_vtk(bmag.ravel(),1,vtk.VTK_FLOAT)
> myout.SetName("B field magnitude")
> imageData.GetPointData().SetScalars(myout)
>
>
> I then used the Filters/Parallel/Testing/Python/testTransmit.py test code
> as a basis to continue the script to work on multiple nodes. Following the
> last line above, I added:
>
> da = vtk.vtkIntArray()
> da.SetNumberOfTuples(6)
> if rank == 0:
>    ext = imageData.GetExtent()
>    for i in range(6):
>       da.SetValue(i,ext[i])
> contr.Broadcast(da,0)
>
> ext = []
> for i in range(6):
>    ext.append(da.GetValue(i))
> ext = tuple(ext)
>
> tp = vtk.vtkTrivialProducer()
> tp.SetOutput(imageData)
> tp.SetWholeExtent(ext)
>
> xmit = vtk.vtkTransmitImageDataPiece()
> xmit.SetInputConnection(tp.GetOutputPort())
> xmit.UpdateInformation()
> xmit.SetUpdateExtent(rank, nranks, 0)
> xmit.Update()
>
> However, when I run this on two nodes, it looks like both of them get the
> same half of the data, rather than the whole dataset getting split between
> the two. Can anyone see what might be wrong? Thanks.
>
> -jeff
>
>
> On 07/23/2015 11:18 AM, David E DeMarle wrote:
>
> Excellent.
>
> No advice yet. Anyone have a worked out example ready? If so, post it to
> the wiki please.
>
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
> On Thu, Jul 23, 2015 at 2:14 PM, Jeff Becker <jeffrey.c.becker at nasa.gov>
> wrote:
>
>> Hi David,
>>
>> On 07/23/2015 10:57 AM, David E DeMarle wrote:
>>
>> pyhon shell runs on the client side.
>>
>> try doing that within the python programmable filter, which runs on the
>> server side.
>>
>>
>> Yes that works. Thanks. Now I will try to use that and follow
>>
>> http://www.paraview.org/pipermail/paraview/2011-August/022421.html
>>
>> to get my existing Image Data producing Python Programmable Source to
>> distribute the data across the servers. Any additional advice? Thanks again.
>>
>> -jeff
>>
>>
>>
>>
>> David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 21 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4909
>>
>> On Thu, Jul 23, 2015 at 1:53 PM, Jeff Becker <jeffrey.c.becker at nasa.gov>
>> wrote:
>>
>>> Hi. I do "mpirun -np 4 pvserver --client-host=xxx
>>> --use-offscreen-rendering", and connect a ParaView client viewer. I can see
>>> 4 nodes in the memory inspector, but when I start a python shell in
>>> ParaView, and do:
>>>
>>> from mpi4py import MPI
>>> print MPI.COMM_WORLD.Get_size()
>>>
>>> I get the answer 1. Shouldn't it be 4? Thanks.
>>>
>>> -jeff
>>>
>>>
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>>
>>
>
>
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