Tim Thank you for your explanation on how OpenMPI uses ssh.
> There is a way to force the ssh sessions to stay open. However doing so > will result in a bunch of excess debug output. If you add > "--debug-daemons" to the mpirun command line, the ssh connections should > stay open. Unfortunately this didn't work either: [jody]:/mnt/data1/neander:$mpirun -np 4 --debug-daemons --hostfile testhosts -x DISPLAY=plankton:0.0 xterm -hold -e ../MPITest Daemon [0,0,1] checking in as pid 19473 on host plankton.unizh.ch Daemon [0,0,2] checking in as pid 26531 on host nano_00 [plankton.unizh.ch:19473] [0,0,1] orted: received launch callback [nano_00:26531] [0,0,2] orted: received launch callback xterm Xt error: Can't open display: plankton:0.0 xterm Xt error: Can't open display: plankton:0.0 xterm Xt error: Can't open display: plankton:0.0 xterm Xt error: Can't open display: plankton:0.0 [plankton.unizh.ch:19473] [0,0,1] orted_recv_pls: received message from [0,0,0] [plankton.unizh.ch:19473] [0,0,1] orted_recv_pls: received exit [nano_00:26531] [0,0,2] orted_recv_pls: received message from [0,0,0] [nano_00:26531] [0,0,2] orted_recv_pls: received exit If i use ":0.0" instead of "plankton:0.0", at least the local processes open their X-terms. Jody
