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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Ken and David,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The end goal is to be able to chart the ratio of different volumes over a time series.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I started with a hand built pipeline in the client: a wavelet source and a threshold. Attached to each is an Integrate Variables filter which provides the volumes
and the ratio is calculated with a Python calculator filter. Then I created a custom filter out of this pipeline. However I discovered that the custom filter is particular about how it is setup. E.g., since it was setup with a wavelet source, it expects a
wavelet source and if I attach it to a vtk image data set the result is garbage.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">That was when I figured I could write a VTK filter and load that as a plugin. I wrote a multiple input connection filter that creates two vtkIntegrateAttribute
ivars and calculates the ratio. Following vtkIntegrateAttributes, it outputs the result as a scalar attached to a vertex cell. This works great in serial. Crashes as soon as I attach it to a pipeline when I’m running in parallel.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">For some reason I had it in my head that each filter stage of the pipeline did a scatter and gather and that my ivars would magically be gathering for me. But
when I was reviewing the ParaView guide it finally sunk in that I was getting 2 vtkIntegrateAttribute ivars for each process and that the only gathering was the final image compositing.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Mark<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Moreland, Kenneth [mailto:kmorel@sandia.gov]
<br>
<b>Sent:</b> Friday, March 28, 2014 10:22 AM<br>
<b>To:</b> David E DeMarle; Vanmoer, Mark W<br>
<b>Cc:</b> paraview<br>
<b>Subject:</b> Re: [Paraview] parallel filter question<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Mark,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">By the way, we might be able to answer your question better if you gave extra information about what you are trying to do. Short of writing a book on the ins
and outs of parallel processing in ParaView, we can only guess what you might need.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Most filters, even though they are run in parallel only need to consider the local partition of data they are given. There are, of course, exceptions, but if
you give us some hints at what you are trying to do we might be able to give you better advice.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">-Ken<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">From:
</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">David E DeMarle <</span><a href="mailto:dave.demarle@kitware.com"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">dave.demarle@kitware.com</span></a><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">><br>
<b>Date: </b>Thursday, March 27, 2014 9:21 AM<br>
<b>To: </b>"Vanmoer, Mark W" <</span><a href="mailto:mvanmoer@illinois.edu"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">mvanmoer@illinois.edu</span></a><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">><br>
<b>Cc: </b>paraview <</span><a href="mailto:paraview@paraview.org"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">paraview@paraview.org</span></a><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">><br>
<b>Subject: </b>[EXTERNAL] Re: [Paraview] parallel filter question<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Pretty much yeah. ParaView does interprocess communication as little as it can.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Grep for vtkMPIController in ParaViewCore/VTKExtensions and VTK/Filters/Parallel for examples of the mechanics of having parallel filters communicate amongst
themselves.<o:p></o:p></span></p>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">David E DeMarle<br>
Kitware, Inc.<br>
R&D Engineer<br>
21 Corporate Drive<br>
Clifton Park, NY 12065-8662<br>
Phone: 518-881-4909<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">On Thu, Mar 27, 2014 at 11:00 AM, Vanmoer, Mark W <</span><a href="mailto:mvanmoer@illinois.edu" target="_blank"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif"">mvanmoer@illinois.edu</span></a><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">>
wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:black">Hi all, I’m actually new to nuts and bolts parallel programming, so this question might be a bit basic. I was re-reading section 13.4 of the ParaView Guide
and wanted to clarify, is it correct to say that ParaView only does gathering for the image output that IceT is going to composite? That for filters that need to use any other data from the pipeline for non-image output, that gathering has to be done by hand?<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#888888"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#888888">Mark<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><br>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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