[Paraview] Parallel Paraview

[Natalie Happenhofer]

Ok, thanks a lot, I believe I understand.. 

But that brings me to another question: 
I´m running paraview on 8 nodes, and my data is sliced into 8 pieces, which I can see when it´s rendering or with the ProcessId-Filter. In my case, its a cuboid and it´s divided into 8 pieces, sliced once in every layer. In order to make the parallelism useful for the algorithmus I implemented in my filters, I need to change the domain for every processor, i.e I want to slice the data into 8 pieces, but slicing it 7 times in the xy-layer. How can I achieve this, where are the domains for each processor specified?

thx a lot,
Natalie

> Date: Wed, 4 Mar 2009 10:49:49 -0500
> Subject: Re: [Paraview] Parallel Paraview
> From: dave.demarle at kitware.com
> To: nataliehapp at hotmail.com
> CC: paraview at paraview.org
> 
> Slightly less briefly than what Ken said:
> 
> In parallel, the end of the pipeline on each processor is told to
> process piece i out of j. Where i is the local processor's rank and j
> is the number of processors. See
> vtkStreamingDemandDrivenPipeline::SetUpdatePiece() and
> SetNumberOfPieces(). That information flows back through the pipeline
> in the RequestUpdateExtent pass. Here each filter along the pipeline
> looks as what it is asked to produce, and tells its inputs what they
> need to produce for it to do that. In your case if the algorithm
> requires the whole domain then filter is telling everything upstream
> to give it everything, and parallelism is only effective AFTER your
> filter. If the algorithm can be changed so that each processor needs
> only a portion of the domain (perhaps using ghostlevels to extent the
> boundaries a bit) then you will get better scalability. After
> RequestUpdateExtent, the RequestData pass happens in which each filter
> executes in turn. In this pass the filter's RequestData() method uses
> the input it is given to fill out the previously agreed extent and
> passes it onward.
> 
> On Wed, Mar 4, 2009 at 10:26 AM, Natalie Happenhofer
> <nataliehapp at hotmail.com> wrote:
> > Hi!
> > I´m not sure if I understood well how Paraview is working in parallel mode:
> > I have started Paraview in client/server mode, i.e. with
> > mpirun -np 8 ./pvserver
> > and then I started the client and connected.
> >
> > I´m not sure how this works with filters: I´ve written a few filters, and
> > when I run Paraview in parallel, is the filter parallelized as well,
> > automatically? That on every piece of data the filter is applied separately
> > and necessary data of other pieces is send there by mpi? Or is the filter
> > computed on a single node and I have to change something in order to make it
> > work parallel?
> > Applying the ProcessId-Filter on the output of my filter, it says that it
> > was computed separately on every piece of dataset, I´m just wondering,
> > because the filter uses the whole dataset to compute the desired output..
> >
> > thx for explaining,
> > Natalie
> >
> >
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> 
> 
> -- 
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
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