Is there a way to troubleshoot plm_rsh_no_tree_spawn=true hang? I have a set of passwordless-ssh nodes, each node can ssh into any other., i.e.,
for h1 in A B C D; do for h2 in A B C D; do ssh $h1 ssh $h2 hostname; done; done works perfectly. Generally tree spawn works, however there is one host where launching mpirun with tree spawn hangs as soon as there are 6 or more host (with launch node also in the host list). If the launcher is not in the host list the hang happens with five hosts. - Anthony
