[Paraview] Pvbatch not performing significantly better in parallel

[Massimiliano Leoni]

Hi Andy,

thanks for your reply. I think my cells are being correctly partitioned. I 
attach a screenshot of the grid when I color it by vtkProcessId.

The spatio-temporal parallelism could do the trick, but the nightly are 
unavailable in this moment and I can't find the plugin in my current 
installations. I'll try again later.

Anyway, I think I should get at least some benefit from pure spatial 
parallelism, which instead I am not experiencing.
Is there any setting I might be missing?

Best regards,
Massimiliano



In data sabato 18 aprile 2015 10:52:10, Andy Bauer ha scritto:
> Hi Massimiliano,
> 
> I don't think the XML unstructured grid reader partitions the data so all
> of your cells are probably just ending up on process 0.
> 
> You may want to look at ParaView's spatio-temporal parallelism (
> http://www.paraview.org/Wiki/Spatio-Temporal_Parallelism). Make sure to use
> a time compartment size of 1 if you're just using the XML unstructured grid
> reader.
> 
> Regards,
> Andy
> 
> On Sat, Apr 18, 2015 at 6:40 AM, Massimiliano Leoni <
> 
> leoni.massimiliano1 at gmail.com> wrote:
> >  Hi everybody,
> > 
> > I am trying to run pvbatch in parallel to render an animation, with a very
> > easy script that looks like
> > 
> >    - import sys
> >    - from paraview.simple import *
> >    -
> >    - # read pvsm file from command line and load it
> >    - stateFile = sys.argv[1]
> >    - simulation = stateFile.split("/")[-1].split(".")[0]
> >    - servermanager.LoadState(stateFile)
> >    -
> >    - # set active view and render animation
> >    - SetActiveView(GetRenderView())
> >    - WriteAnimation(simulation + ".jpg",magnification=2,quality=2)
> > 
> > I compiled paraview from sources, configuring with
> > 
> > cmake -DPARAVIEW_BUILD_QT=OFF -DCMAKE_BUILD_TYPE=Release
> > -DBUILD_TESTING=OFF -DPARAVIEW_ENABLE_PYTHON=ON -DPARAVIEW_USE_MPI=ON ..
> > 
> > and then building all.
> > 
> > I am doing a benchmark on 11GB of data distributed over many pvd/vtu files
> > [written by an MPI application in parallel].
> > 
> > I copied the data to a tmpfs folder to ensure the execution is not slowed
> > down by disk access.
> > 
> > Executing pvbatch on 1 or 16 processors doesn't really seem to change
> > anything.
> > In particular, I was expecting to see the frames appearing in blocks of 16
> > when running with mpi on 16 procs, but they always appear one at a time at
> > a constant pace, which makes me suspect that the other processes aren't
> > really contributing to the rendering.
> > 
> > 
> > 
> > What could I be doing wrong?
> > Any suggestion is highly appreciated.
> > 
> > Best regards,
> > 
> > Massimiliano
> > 
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