[vtkusers] PVTS, Multiblock or Both

Andy Bauer andy.bauer at kitware.com
Tue Dec 13 10:31:39 EST 2016


I would recommend using the pvts format since that is the best format for
storing structured grids. If you read it back in it will know how to
properly partition the data set for different amounts of processes as well
as do things like ghost cells, extract surfaces, etc.

For topologically structured grids like vtkStructuredGrid there are two
types of extents, "whole extent" describes the beginning and ending node
(inclusive) in each direction for the entire grid while "extent" refers to
each process's (or pieces if you're serial but doing streaming) partition
of the grid. I believe this should be explained in the VTK User's Guide
which is now available for free as a pdf download.


On Tue, Dec 13, 2016 at 10:21 AM, Philip Sakievich <psakievich at gmail.com>

> Greetings,
> I am reasonably new to vtk and I am mainly using it to manage datasets on
> structured grids.
> I am trying to write data for a structured grid in parallel python via
> MPI.  Each process has a separate portion of the grid, and I'm trying to
> figure out how to set up the write process. I was following this example:
> http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=IO/
> ParallelXML/Testing/Python/testParallelXMLWriters.py
> But then I realized that in this case each process has the entire grid,
> and each processor is just writing a portion of the data it contains.  So
> do I need to use a multiblock data set?  Can someone please provide a
> simple example of how to write a structured grid in parallel provided each
> process has the local extent correctly specified?
> Thanks
> --
> Phil Sakievich
> PhD Candidate - Mechanical Engineering
> Arizona State University - Ira A. Fulton School for Engineering of Matter
> Transport and Energy
> Tempe, Arizona
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