A central pillar of the DEEP software stack in the DEEP projects is ParaStation MPI, an MSA-enabled implementation of the Message-Passing Interface (MPI) standard.

The MSA architecture provides and unprecedented level of flexibility, efficiency and performance by combining modules with different characteristics. Moreover, some module can be also heterogeneous, combining different compute, memory and network devices on the same node. These two levels of intra- and inter-node heterogeneity are hard to leverage with a programming models that rely only on traditional fork-join and/or Single Program Multiple Data (SPMD) execution models.