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Subject: [OMPI users] Problem running on multiple nodes with Java bindings
From: Christoffer Hamberg (christoffer.hamberg_at_[hidden])
Date: 2013-11-10 12:24:32


I'm having some strange problems running Open MPI(1.9a1r29559) with Java
bindings on a Calxeda highbank ARM Server running Ubuntu 12.10 (GNU/Linux
3.5.0-43-highbank armv7l).

The problem arises when I try to run a job on more than 3 nodes (I have a
total of 8).
Note: It's the same error for any of the node[0-7].

ubuntu_at_node0:~$ mpirun -np 4 -host node0,node1,node2 hostname
Host key verification failed.

ubuntu_at_node0:~$ mpirun -np 4 -host node0,node1,node2,node3 hostname

and not running the job on the current node also gives Host key
verification failed for only 3 nodes.

ubuntu_at_node0:~$ mpirun -np 4 -host node1,node3,node5 hostname
Host key verification failed.

But not on 2 nodes:
ubuntu_at_node0:~$ mpirun -np 4 -host node1,node3 hostname

I've configured it with the following:
./configure --prefix=/opt/openmpi-1.9-java --without-openib --enable-static
--with-threads=posix --enable-mpi-thread-multiple --enable-mpi-java

I have Open MPI 1.6.5 (without Java-binding) installed and it runs without
any problems on all nodes, so there should be no problem with SSH that the
error points to.

Any ideas?