HDF5 and GFPS optimizations

We're exploring ways to get better MPI-IO performance out of our Blue
Gene systems running GPFS. HDF5 happens to have a nice collection of
GPFS-specific optimizations if you --enable-gpfs.

Before I spend much time experimenting with those options, I was
curious if anyone's tried them with recent (gpfs-3.4 or gpfs-3.5)
versions of GPFS. I suspect they still work (the gpfs-specific
IOCTLS, i mean: i'm sure HDF5's implementation of them is fine), but
would like to hear others experiences.



Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA