[Paraview] Volume Rendering 17GB 8.5 billion cell volume

[Berk Geveci]

Hey David,

I am hoping to have some time to play around with volume rendering and
hopefully tracking this issue, one thing that I wanted to clarify: it
sounds from you description that you have a short (2 byte) value. Is that
correct?

Thanks,
-berk

On Wed, Sep 9, 2015 at 5:00 PM, David Trudgian <
david.trudgian at utsouthwestern.edu> wrote:

> 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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