I’m attempting to use MPICH to manage a number of non-MPI processes.    The latter call system() and fork(), which as I understand it may  cause undefined behavior if they were spawned as MPI processes.   How do I use MPI_Comm_spawn() to launch these processes?

For example, OpenMpi has a key for the “info” field named “ompi_non_mpi”, which causes a non-MPI process to be spawned.   Is there something similar in MPICH?

Thanks,

Kurt