Take a look at the man page for MPI_Comm_spawn. It should explain that
you need to create an MPI_Info key that has the key of "host" and a
value that contains a comma-delimited list of hosts to be used for the
child processes.
Hope that helps
Ralph
On Jul 28, 2008, at 8:54 AM, Mark Borgerding wrote:
How does openmpi decide which hosts are used with MPI_Comm_spawn?
All the docs I've found talk about specifying hosts on the mpiexec/
mpirun command and so are not applicable.
I am unable to spawn on anything but localhost (which makes for a
pretty uninteresting cluster).
When I run
ompi_info --param rds hostfile
It reports MCA rds: parameter
"rds_hostfile_path" (current value: "/usr/lib/openmpi/1.2.5-gcc/etc/
openmpi-default-hostfile")
I tried changing that file but it has no effect.
I am using
openmpi 1.2.5
CentOS 5.2
ethernet TCP
-- Mark
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