Use MPI_STATUS_SIZE by default / should work for MPICH and OpenMPI
Use MPI_STATUS_SIZE by default / should work for MPICH and OpenMPI

RWTH-HPC/PnMPI,RWTH-ELP/PnMPI,RWTH-ELP/PnMPI,RWTH-HPC/PnMPI,RWTH-HPC/PnMPI,RWTH-ELP/PnMPI