#2187: comet files in simfactory use in MPI rank per node ---------------------------------+------------------------- Reporter: Roland Haas | Type: enhancement Status: new | Priority: minor Milestone: | Component: SimFactory Version: development version | Keywords: ---------------------------------+------------------------- The current (https://bitbucket.org/simfactory/simfactory2/src/master/mdb/machines/comet.i...) uses 1 MPI rank per node: {{{ max-num-threads = 24 num-threads = 24 }}}
This is usually not the best way to set things up, I would eg have expected that the default choice would be something like 1 MPI rank per NUMA domain. Given that, unless limited by communication overhead, we seem to obtain fastest per-node performance when using only MPI and no OpenMP (about a factor of 50% speedup on my 12 core workstation with 2 NUMA domains) if anyone is using Comet for production work and wants to contribute their machine description file that would be great.