Skip to content
Skip to breadcrumbs
Skip to header menu
Skip to action menu
Skip to quick search

HDF Knowledge Base Parallel HDF5 Performance Issues

GPFS Optimizations

If encountering issues with performance on GPFS, there are two parameters that you can tune:

The bglockless prefix: https://press3.mcs.anl.gov/romio/2013/08/05/bglockless/
With MPICH-3.1.1 and beyond this is no longer a problem: http://press3.mcs.anl.gov/romio/2014/06/05/new-romio-optimizations-for-blue-gene-q/
bg_nodes_pset controls the number of aggregators. (See How to pass hints to MPI from HDF5.)