[hdf-forum] Parallel hdf5 on BlueGene

[Robert Latham]

On Fri, Mar 06, 2009 at 06:17:37PM +0000, Ricardo Fonseca wrote:
> P.S -> (rob) Thanks for the input, this work is actually in preparation 
> for a BlueGene system. Could you tell me if that flag is set on your 
> configuration? If you just look into $H5DIR/include/H5pubconf.h around 
> line 431 you can check the definition of the  
> H5_MPI_COMPLEX_DERIVED_DATATYPE_WORKS macro.

A couple more notes for HDF5 on BlueGene 

- BlueGene requires cross compiling, so you'll need to set quite a few
  environment variables to get configure to work correctly

- The configure tests for the fortran and C++ bindings are run-time
  only tests, and so will only work if you trick configure into
  executing its tests on the compute node.  At least one person at
  argonne know how to do this, but I'm still learning myself.

- Your choice of file system will make a big difference in
  experiences.  I hope your BlueGene has either GPFS or PVFS, and does
  not have Lustre.   (This is not an issue with HDF5, but rather with
  the MPI-IO library.  An active area of effort, though)

If you or your site runs into problems, it's probably best to post
here.   I'll be happy to share what I know.

==rob

-- 
Rob Latham
Mathematics and Computer Science Division    A215 0178 EA2D B059 8CDF
Argonne National Lab, IL USA                 B29D F333 664A 4280 315B

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