METIS/ParMETIS not available on Cosma?
Just realized that the MPI version is not rebalancing the load between nodes since it was not compiled with METIS. By default, if METIS is not enabled (HAVE_METIS
), it just sticks with the initial grid and never rebalances.
There is a module metis/5.1.0
, but it does not play well with intel_comp/c5/2015
and does not seem to have been compiled with MPI enabled, i.e. ParMETIS.
Without METIS/ParMETIS there is no load balancing, and are MPI results will be terrible.