Ken, Issue created. Can you suggest any other way to launch non-MPI processes? Thanks, Kurt -----Original Message----- From: Raffenetti, Kenneth J. <[email protected]> Sent: Tuesday, January 7, 2020 9:32 AM To: [email protected] Cc: Mccall, Kurt E. (MSFC-EV41) <[email protected]> Subject: [EXTERNAL] Re: [mpich-discuss] How to spawn a non-MPI process with MPI_Comm_spawn 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://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_pmodels_mpic... 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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