Hello,
I have an HDF5 file with one big dataset that needs to be read by many
MPI processes exclusively (that is, every process reads its own
non-overlapping portion of data). Should I
I. use parallel HDF5 file access (HDF5D_MPI driver) with non-collective
dataset reading, or
II. use non-parallel HFD5 file access (default driver; simply open the
file multiple times without caring about MPI)?
Is there any significant performance difference between these two options?
Thanks for help,
Daniel
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