[vtkusers] Partitioning Data

[Berk Geveci]

Inserting a distributed data filter between the reader and the writer
should theoretically work. Of course, you can easily run a ParaView
(pvbatch) script with 4 processes to do the same thing.

On Tue, Dec 29, 2009 at 9:07 AM, Terry Jordan <Terry.Jordan at netl.doe.gov> wrote:
> Yes, I want to break the mesh down.  I want to partition the entire data set
> into 4 chunks.  Does anyone have a link to sample code?  I tried to use the
> distributed data filter, but was unsuccessful in its implementation.  I
> assume the file format would still be a pvtu and 4 vtus.
>
>>>> "Berk Geveci" <berk.geveci at kitware.com> 12/28/2009 10:18 PM >>>
> or the distributed data filter in VTK.
>
> On Mon, Dec 28, 2009 at 5:57 PM, Dominik Szczerba <dominik at itis.ethz.ch>
> wrote:
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>> I don't think this is intended to partition your mesh, or at least I
>> would be highly (if positively) surprised.
>>
>> Do you not mean to partition a mesh for e.g. domain decomposition
>> purposes or other parallel applications? Then metis or chaco is what you
>> need here.
>>
>> Dominik
>>
>> Terry Jordan wrote:
>>>
>>> I am trying to partition a unstructured grid into 4 evenly sized
>>> pieces.  Currently I am doing the following:
>>>
>>> vtkXMLPUnstructuredGridWriter *writer =
>>> vtkXMLPUnstructuredGridWriter::New();
>>> writer->SetInput( filteredGrid );
>>> writer->SetFileName(vtkFilename);
>>> writer->SetNumberOfPieces( 4 );
>>> writer->SetStartPiece(0);
>>> writer->SetEndPiece(3);
>>> writer->Write();
>>>
>>> filteredGrid is a vtkUnstructuredGrid
>>>
>>> The result of this code is 4 copies of the data (1 pvtu and 4 vtu).
>>> Each is identical to the original data.  What am I missing?  I am
>>> running this code on a single cpu without the use of MPI.  Do I have to
>>> use MPI?
>>>
>>> Thanks in advance.
>>>
>>>
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>
>