We do not support such a key at this time, but it seems reasonable to add. Could you create an issue on our GitHub? https://github.com/pmodels/mpich Thanks, Ken On 1/6/20 9:50 AM, Mccall, Kurt E. (MSFC-EV41) via discuss wrote:

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

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