[Paraview] [EXTERNAL] Volume Rendering 17GB 8.5 billion cell volume

[Scott, W Alan]

I have nothing to add, other than volume rendering 8 billion cells would be amazing.  ParaView should grumble, but maybe you are running out of memory?  Try using the View/ Memory Inspector for the datasets below that actually do work?  Then, do the same for your big one?


Alan

-----Original Message-----
From: ParaView [mailto:paraview-bounces at paraview.org] On Behalf Of David Trudgian
Sent: Wednesday, September 09, 2015 3:00 PM
To: paraview at paraview.org
Subject: [EXTERNAL] [Paraview] Volume Rendering 17GB 8.5 billion cell volume

Hi,

We have been experimenting with using Paraview to display very volumes from very large TIFF stacks generated by whole-brain microscopy equipment. The test stack has dimensions of 5,368x10,695x150. Stack is assembled in ImageJ from individual TIFFs, exported as a RAW and loaded into paraview. Saved as a .vti for convenience. Can view slices fine in standalone paraview client on a 256GB machine.

When we attempt volume rendering on this data across multiple nodes with MPI nothing appears in the client. Surface view works as expected. On switching to volume rendering the client's display will show nothing. There are no messages from the client or servers - no output.

This is happening when running pvserver across GPU nodes with NVIDIA Tesla cards, or using CPU only with OSMESA. pvserver memory usage is well below what we have on the nodes - no memory warnings/errors.

Data is about 17GB, 8 billion cells. If we downsize to ~4GB or ~9GB then we can get working volume rendering. The 17GB never works regardless of scaling nodes/mpi processes. The 4/9GB will work on 1 or 2 nodes.

Am confused by the lack of rendering, as we don't have memory issues, or an other messages at all. Am wondering if there are any inherent limitation, or I'm missing something stupid.

Thanks,

Dave Trudgian


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