Hi Tim > Your desktop is plankton, and you want > to run a job on both plankton and nano, and have xterms show up on nano.
Not on nano, but on plankton, but ithink this was just a typo :) > It looks like you are already doing this, but to make sure, the way I > would use xhost is: > plankton$ xhost +nano_00 > plankton$ mpirun -np 4 --hostfile testhosts -x DISPLAY=plankton:0.0 > xterm -hold -e ../MPITest This gives me 2 lines of xterm Xt error: Can't open display: plankton:0.0 > > Can you try running: > plankton$ mpirun -np 1 -host nano_00 -x DISPLAY=plankton:0.0 printenv This yields DISPLAY=plankton:0.0 OMPI_MCA_orte_precondition_transports=4a0f9ccb4c13cd0e-6255330fbb0289f9 OMPI_MCA_rds=proxy OMPI_MCA_ras=proxy OMPI_MCA_rmaps=proxy OMPI_MCA_pls=proxy OMPI_MCA_rmgr=proxy SHELL=/bin/bash SSH_CLIENT=130.60.49.141 59524 22 USER=jody LD_LIBRARY_PATH=/opt/openmpi/lib SSH_AUTH_SOCK=/tmp/ssh-enOzt24653/agent.24653 MAIL=/var/mail/jody PATH=/opt/openmpi/bin:/usr/local/bin:/bin:/usr/bin PWD=/home/jody SHLVL=1 HOME=/home/jody LOGNAME=jody SSH_CONNECTION=130.60.49.141 59524 130.60.49.128 22 _=/opt/openmpi/bin/orted OMPI_MCA_mpi_yield_when_idle=0 OMPI_MCA_mpi_paffinity_processor=0 OMPI_MCA_universe=j...@aim-plankton.unizh.ch:default-universe-10265 OMPI_MCA_ns_replica_uri=0.0.0;tcp://130.60.49.141:50310 OMPI_MCA_gpr_replica_uri=0.0.0;tcp://130.60.49.141:50310 OMPI_MCA_orte_app_num=0 OMPI_MCA_orte_base_nodename=nano_00 OMPI_MCA_ns_nds=env OMPI_MCA_ns_nds_cellid=0 OMPI_MCA_ns_nds_jobid=1 OMPI_MCA_ns_nds_vpid=0 OMPI_MCA_ns_nds_vpid_start=0 OMPI_MCA_ns_nds_num_procs=1 > > just to make sure the environment variable is being properly set. > > You might also try: > in terminal 1: > plankton$ xhost +nano_00 > > in terminal 2: > plankton$ ssh -x nano_00 > nano_00$ export DISPLAY="plankton:0.0" > nano_00$ xterm > This experiment also gives xterm Xt error: Can't open display: plankton:0.0 > This will ssh into nano, disabling ssh X forwarding, and try to launch > an xterm. If this does not work, then something is wrong with your x > setup. If it does work, it should work with Open MPI as well. > So i guess something is wrong with my X setup. I wonder what it could be ... Doing the same with X11 forwarding works perfectly. But why is X11 forwarding bad? Or differently asked, does Opem MPI make the ssh connection in such a way that X11 forwarding is disabled? Thank YOu Jody
