> On Jun 21, 2019, at 4:04 PM, Ralph Castain via users 
> <users@lists.open-mpi.org> wrote:
> I’m unaware of any “map-to cartofile” option, nor do I find it in mpirun’s 
> help or man page. Are you seeing it somewhere?

From "mpirun —help”:

tin 1431 : mpirun --help mapping
mpirun (Open MPI) 4.0.1

Usage: mpirun [OPTION]...  [PROGRAM]...
Start the given program using Open RTE

   -cf|--cartofile <arg0>  
                         Provide a cartography file
followed by all the other mapping-related options.

Maybe what I want is best described as not doing round-robin, but I see no way 
to do that either.

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