[Paraview] Which readers are parallel and which are not?

[David E DeMarle]

Other than look in the source code and see how each reader handles
UPDATE_EXTENT/UPDATE_PIECE_NUMBER* no.

The default behavior for a reader which doesn't understand parallelism
is to have every node read the whole file and let the pipeline clip
out and deallocate everything owned by the other nodes just after the
reader.

Readers that do understand parallelism vary in what specific strategy
they use to support it. Most have each node read a different file or
stripe of the same file and get just the local portion of the data. I
gather that some of the newer readers read larger portions on some
nodes and transmit over MPI the subportions that other nodes are
responsible (like the vtkTransmitX filters) for.

This question has been asked twice recently so I'll see about
compiling a list and putting a description of the parallel strategy
that each reader uses into the XML and thus book and help. In the mean
time ask the list about any particular reader and someone will most
likely answer what that reader does.

*see http://paraview.org/Wiki/Writing_ParaView_Readers

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



On Wed, Feb 15, 2012 at 12:31 PM, Cook, Rich <cook47 at llnl.gov> wrote:
> Is there a way to determine if a reader works in parallel?  I'm having a reader crash when run in parallel, and I'm not sure which are supposed to handle parallelism and which aren't, and if not, then is it supposed to crash or give an error or...?
> Thanks.
> --
> ✐Richard Cook
> ✇ Lawrence Livermore National Laboratory
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> ---
> Information Management & Graphics Grp., Services & Development Div., Integrated Computing & Communications Dept.
> (opinions expressed herein are mine and not those of LLNL)
>
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