[Paraview] [Xdmf] ParaView/Xdmf bad memory usage

[Jerry Clarke]

Renato,

You are correct, it should only load one iteration, not all at once.
Could you please try to load the geometry only (no scalars) and see
what happens.


Thanks
Jerry


Renato N. Elias wrote:
> 
> There's something wrong with memory allocation employed by ParaView 
> (3.4.0) OR Xdmf library. When I load a temporal collection of spatial 
> collections it seems that ParaView (or Xdmf) is trying to allocate 
> memory for all time steps at once as it were a multiblock of 
> multiblocks. My guess is that each time step should be loaded when 
> required AND after unloading the previous time step in order to release 
> some memory. Is there any workaround for this problem or it was really 
> designed to work in this way?
> 
> Regards
> 
> Renato.
> 
> p.s.: I can provide a large dataset (40M tets/128 cpus/15 time steps) 
> for debugging purposes.
> 
> ------------------------------------------------------------------------
> 
> Subject:
> Rendering large datasets using offscreen rendering...
> From:
> "Renato N. Elias" <rnelias at nacad.ufrj.br>
> Date:
> Tue, 04 Nov 2008 14:21:37 -0200
> To:
> "paraview at paraview.org" <paraview at paraview.org>
> 
> To:
> "paraview at paraview.org" <paraview at paraview.org>
> 
> 
> 
> Folks, I need some tips for rendering a large dataset using offscreen 
> rendering in a SGI Altix-ICE.
> 
> Basically, I have a 40 million tetrahedra mesh partitioned in 128 cpus. 
> The result is stored in Xdmf format (15 time steps) and I can 
> successfully load the datasets in ParaView 3.4.0 and do basic things  
> like plot the result in isosurfaces or colorize the model with a scalar 
> field. The problem begins to happen when I try to change the model 
> opacity. PV takes forever before crashing MPI.
> 
> I guess that the problem with opacity is due to the compositing order 
> but I can't figure out a way to use it. I already tried to disable 
> ordered compositing but it hasn't helped so much.
> 
> Any idea would be appreciated. Thanks,
> 
> Renato.
> 
> 
> ------------------------------------------------------------------------
> 
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