Jean,
Has the large grid ever worked in the past ... I may have
broken the extents when I modified the parallelism for spatial
collections.
If I broke the parallelism, that might explain the slowness
on smaller grids.
I'm assuming that the Xdmf xml just specifies a single
structured grid.
Jerry
Jean Favre wrote:
Eric E. Monson wrote:
We use the Xdmf wrappers for our HDF5 for now.
I am still encounteering major difficulties with Xdmf (cvs version of
yesterday). Speed and Memory. When reading in parallel for example, the
Xdmf reader attemps to allocate memory for the WHOLE grid on every node
(independent of the number of pvserver nodes) causing memory crashes.
There must be a problem reading the Extents. Using straight HDF5, I pass
the Extents as hyperslabs and it works fine. I can read 2048^3 in
parallel. For smaller grids, if memory is not a problem, the Xdmf
wrapper works too, still considerably slower.
Jean -- Swiss National Supercomputing Centre
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