Issues when changing domain in ACCESS-rAM3

[Paul.Gregory]

Here is a better explanation of the NPROC error:

ACCESS-rAM3 'Flagship' Experiments

OpenMP doesn’t require a recompile, just set environment variable $OMP_NUM_THREADS (normally done in the Cylc task configuration) and make sure the PBS number of CPUs is (MPI ranks) * (OMP threads) NPROC restriction is because there’s a minimum grid size for each process, e.g. halo of cells going to the north MPI rank can’t overlap with the halo of cells going to the south MPI rank.