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  1. 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/
  2. bg_nodes_pset controls the number of aggregators. (See How to pass hints to MPI from HDF5.)