How is OpenMPI loaded?

Load the openmpi module for use Coeus.

$ module load openmpi

How is something ran with OpenMPI?

It is recommended to use mpiexec to start an MPI program. The example on Coeus (below) will compile the program and then create four copies of the executable and run them all where they all can communicate using MPI.

$ module load openmpi

$ mpicc -o my_example my_example.c

$ mpiexec -n 4 my_example

There are several compilers for MPI available in the module.

$ /bin/ls /software/builds/openmpi/4.1.4/bin/

aggregate_profile.pl  mpicxx   mpifort     ompi_info   orte-server  profile2mat.pl

mpiCC       mpiexec  mpirun     opal_wrapper  ortecc

mpic++       mpif77   ompi-clean   orte-clean   orted

mpicc       mpif90   ompi-server  orte-info   orterun