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From: Jean Latour (latour_at_[hidden])
Date: 2006-03-02 11:12:18


Testing the MPI_Comm_Spawn function of Open MPI version 1.0.1, I have an
example that works OK,
except that it shows that the spawned processes do not follow the
"machinefile" setting of processors.
In this example a master process spawns first 2 processes, then
disconnects from them and spawn 2 more
processes. Running on a Quad Opteron node, all processes are running on
the same node, although the
machinefile specifies that the slaves should run on different nodes.

 With the actual version of OpenMPI is it possible to direct the spawned
processes on
a specific node ? (the node distribution could be given in the
"machinefile" file, as with LAM MPI)

The code (Fortran 90) of this example and makefile is attached as a tar

Thank you very much

Jean Latour