ParaStation MPI relies on a low-level communication layer called pscom and provides full MPI-4 compliance.

Since it is configured with the Process Management Interface for Exascale (PMIx), an external job launcher is required to run MPI jobs spawning multiple nodes, typically in a high-performance computing environment.

For instance using the Slurm Workload Manager, applications would be executed with:

srun --mpi=pmix mpi_application

For single-node jobs (here with 2 processes) use instead prterun :

prterun -np 2 ./mpi_application"