2009/1/24 Gerry Creager <gerry.crea...@tamu.edu> > Couple of follow-up notes. > > MTU=4500: Had one node fall over with the same overflow errors. > MTU=3000: A WRF model is running, but single timesteps are executing 2.5x > slower than MTU=1500 > > Are you using openmpi? Some openmpi versions always enable the naggle algorithm: http://www.open-mpi.org/community/lists/users/2007/07/3752.php
Perhaps tunning openmpi buffer parameters could help with performance.
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