so for my tests, Open MPI did follow the machinefile (see output)
further below, however, for each spawn operation it starts from the very
beginning of the machinefile...
The following example spawns 5 child processes (with a single
MPI_Comm_spawn), and each child prints its rank and the hostname.
gabriel@linux12 ~/dyncomm $ mpirun -hostfile machinefile -np 3
./dyncomm_spawn_father
Checking for MPI_Comm_spawn.....................working
Hello world from child 0 on host linux12
Hello world from child 1 on host linux13
Hello world from child 3 on host linux15
Hello world from child 4 on host linux16
Testing Send/Recv on the intercomm..........working
Hello world from child 2 on host linux14
with the machinefile being:
gabriel@linux12 ~/dyncomm $ cat machinefile
linux12
linux13
linux14
linux15
linux16
In your code, you always spawn 1 process at the time, and that's why
they are all located on the same node.
Hope this helps...
Edgar
Edgar Gabriel wrote:
as far as I know, Open MPI should follow the machinefile for spawn
operations, starting however for every spawn at the beginning of the
machinefile again. An info object such as 'lam_sched_round_robin' is
currently not available/implemented. Let me look into this...
Jean Latour wrote:
Hello,
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
file.
Thank you very much
Jean Latour
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Edgar Gabriel
Assistant Professor
Department of Computer Science email:gabr...@cs.uh.edu
University of Houston http://www.cs.uh.edu/~gabriel
Philip G. Hoffman Hall, Room 524 Tel: +1 (713) 743-3857
Houston, TX-77204, USA Fax: +1 (713) 743-3335
