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Subject: [OMPI users] How to specify hosts for MPI_Comm_spawn
From: Mark Borgerding (markb_at_[hidden])
Date: 2008-07-28 10:54:38

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