[Paraview-developers] Using OpenMP for custom plugins/filters

[Utkarsh Ayachit]

Michael,

The VTK-SMP approach is indeed the way to go for this. To make the
backend use OpenMP, you simply compile VTK/ParaView with
VTK_SMP_IMPLEMENTATION_TYPE set to OpenMP. The programming model
described in the SMP Guide PDF has been implemented for all supported
backends including OpenMP and TBB.

Utkarsh

On Tue, Mar 8, 2016 at 6:22 AM, Schlottke-Lakemper, Michael
<m.schlottke-lakemper at aia.rwth-aachen.de> wrote:
> Hi everyone,
>
> We have a custom parallel reader plugin that works well with our files even
> on large-ish (100-1000) number of cores for the pvserver. Recently we’ve
> added the capability to also create ghost cells with this reader such that
> MPI domain boundaries become transparent to filters that need neighbor data,
> e.g., for gradient computations. However, this ghost cell generation takes
> up quite some time, so we would like to keep the number of MPI ranks at a
> minimum and use hybrid MPI-OpenMP parallelism for our plugin.
>
> My question is thus if it is possible to use OpenMP inside a custom plugin?
> And if yes, is there a canonical way to do it (maybe an example plugin) or
> is it going to be a hack?
>
> When searching the interwebs for ParaView and OpenMP, I only came up with an
> old VTK mailing list thread from 2014
> (http://public.kitware.com/pipermail/vtkusers/2014-March/083399.html), in
> which David (DeMarle) refers to some initial documentation of the SMP
> framework (http://www.vtk.org/Wiki/images/3/3b/VTK_SMP_Guide.pdf). However,
> the linked PDF does not contain references to OpenMP.
>
> Thanks a lot in advance!
>
> Michael
>
> --
> Michael Schlottke-Lakemper
>
> Chair of Fluid Mechanics and Institute of Aerodynamics
> RWTH Aachen University
> Wüllnerstraße 5a
> 52062 Aachen
> Germany
>
> Phone: +49 (241) 80 95188
> Fax: +49 (241) 80 92257
> Mail: m.schlottke-lakemper at aia.rwth-aachen.de
> Web: http://www.aia.rwth-aachen.de
>
>
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