Hi, 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@node0:~$ mpirun -np 4 -host node0,node1,node2 hostname Host key verification failed. ubuntu@node0:~$ mpirun -np 4 -host node0,node1,node2,node3 hostname node0 node0 node1 node2 and not running the job on the current node also gives Host key verification failed for only 3 nodes. ubuntu@node0:~$ mpirun -np 4 -host node1,node3,node5 hostname Host key verification failed. But not on 2 nodes: ubuntu@node0:~$ mpirun -np 4 -host node1,node3 hostname node1 node1 node3 node3 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 --with-jdk-bindir=/usr/lib/jvm/java-7-openjdk-armhf/bin --with-jdk-headers=/usr/lib/jvm/java-7-openjdk-armhf/include 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? Regards, Christoffer
