NVHPC + MPI

[ptheywood]

Document how MPI can be used with the NVHPC modules.

Either

• Load an MPI module (openmpi / mvapich) then load NVHPC

• Load NVHPC and set additional environmental variables to load the NVHPC provided MPI.

  # Based on UKRI hackathon slack post from MD
  export NVHPC_ROOT=$NVHPC/Linux_ppc64le/21.5
  export OPAL_PREFIX=$NVHPC_ROOT/comm_libs/mpi
  export PATH=$NVHPC_ROOT/comm_libs/mpi/bin:$PATH
  export LD_LIBRARY_PATH=$NVHPC_ROOT/comm_libs/mpi/lib:$LD_LIBRARY_PATH
  export CPATH=$NVHPC_ROOT/comm_libs/mpi/include:$CPATH
  export ARC_MPI=openmpi

  • It may be worth describing how to create your own module file to do this?