Are there other uses for the GASPI segments, apart from access to remote memory on heterogeneous architectures?

GASPI memory segments allow different memory management systems to co-exist, e.g. to allow for a symmetric distributed global memory management (like OpenShmem) in one GASPI segment and an asymmetric (e.g. stack based) distributed global memory management in another GASPI segment.

GASPI can also leverage the segments to allow for a global tight coupling of multiple applications, e.g. a multiphysics solver. While every solver then uses its own memory segment, the GASPI API allows the solvers to directly read and write from/to the partitioned global memory of all the other solvers involved in the computation.

In contrast to MPI, the GASPI node set is not static. In principle, GASPI thus allows the application to start yet another process group for the online evaluation of the simulation and  to expose the memory segments of the running multiphysics solver to the evaluation process group.