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For debugging i usually run each process in a separate X-window.
This works well if i set the DISPLAY variable to the computer
from which i am starting my OpenMPI application.
This method fails however, if i log in (via ssh) to my workstation
from a third computer and then start my OpenMPI application,
only the processes running on the workstation i logged into can
open their windows on the third computers. The processes on
the other computers cant open their windows.
This is how i start the processes
mpirun -np 4 -x DISPLAY run_gdb.sh ./TestApp
where run_gdb.sh looks like this
echo "Running GDB on node `hostname`"
xterm -e gdb $*
The output from the processes on the other computer:
xterm Xt error: Can't open display: localhost:12.0
I there a way to tell OpenMPI to forward the X windows
over yet another ssh connection?