[vtkusers] vtk.vtkDistributedDataFilter() not works

[Cory Quammen]

I'm not 100% sure of this, but the vtkPointSource produces an output
with only 1 cell. That may not be partitionable by the
vtkDistributeDataFilter. You shouldn't get duplicate output in each
piece, but let's not worry about that for now.

Try swapping out the vtkPointSource with a vtkSphereSource and see if
the data is partitioned.

HTH,
Cory

On Sat, Dec 3, 2016 at 8:57 PM, Magician <f_magician at mac.com> wrote:
> Hi Cory,
>
>
> Thanks for your advice.
>
> Hmmm...I already run the script with MPI.
> The attached script is a minimal sample.
>
>
> If I execute it, pvtu file is exported.
> But the all piece sources are exactly same, and not partitioned.
>
>
>
> Magician
>
>
>> On Nov 28, 2016, at 06:19, Cory Quammen <cory.quammen at kitware.com> wrote:
>>
>> I think you need to run your script in parallel with MPI for the
>> partitioning to work. See [1] for an example of how to use this
>> filter.
>>
>> Hope that helps,
>> Cory
>>
>> [1] http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=Filters/Parallel/Testing/Cxx/DistributedData.cxx
>>
>> On Sun, Nov 27, 2016 at 10:39 AM, Magician <f_magician at mac.com> wrote:
>>> Does anyone use the vtkDistributedDataFilter?
>>>
>>>
>>> On Nov 19, 2016, at 18:16, Magician <f_magician at mac.com> wrote:
>>>
>>> Hi all,
>>>
>>>
>>> I posted the message about partitioning datasets.
>>> <http://public.kitware.com/pipermail/vtkusers/2016-November/097123.html>
>>>
>>> I still trying vtk.vtkDistributedDataFilter(), but the exported data aren’t
>>> partitioned.
>>> My VTK version is 7.1.0 (pvpython with ParaView 5.2.0 RC3) and executing on
>>> 2 CPUs.
>>>
>>> Here is the sample code:
>>>
>>>    import vtk
>>>
>>>    source = vtk.vtkPointSource()
>>>    source.SetCenter((0.0, 0.0, 0.0))
>>>    source.SetNumberOfPoints(1000000)
>>>    source.SetRadius(1.0)
>>>    source.Update()
>>>
>>>    d3 = vtk.vtkDistributedDataFilter()
>>>    d3.SetInputData(source.GetOutput())
>>>    d3.SetBoundaryMode(0)
>>>    d3.Update()
>>>
>>>    writer = vtk.vtkXMLPUnstructuredGridWriter()
>>>    writer.SetInputData(d3.GetOutput())
>>>    writer.SetFileName(’test.pvtu’)
>>>    writer.SetNumberOfPieces(2)
>>>    writer.WriteSummaryFileOn()
>>>    writer.SetStartPiece(0)
>>>    writer.SetEndPiece(1)
>>>    writer.Write()
>>>
>>> How to partition data?
>>>
>>>
>>> Magician
>>>
>>>
>>>
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>>
>>
>>
>> --
>> Cory Quammen
>> Staff R&D Engineer
>> Kitware, Inc.
>
>



-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.