Hi Jody,
Sorry for the super long delay. I don't know how this one got lost...
I run like this all the time. Unfortunately, it is not as simple as I
would like. Here is what I do:
1. Log into the machine using ssh -X
2. Run mpirun with the following parameters:
-mca pls rsh (This makes sure that Open MPI uses the rsh/ssh launcher.
It may not be necessary depending on your setup)
-mca pls_rsh_agent "ssh -X" (To make sure X information is forwarded.
This might not be necessary if you have ssh setup to always forward X
information)
--debug-daemons (This ensures that the ssh connections to the backed
nodes are kept open. Otherwise, they are closed and X information cannot
be forwarded. Unfortunately, this will also cause some debugging output
to be printed, but right now there is no other way :( )
So, the complete command is:
mpirun -np 4 -mca pls rsh -mca pls_rsh_agent "ssh -X" --debug-daemons
xterm -e gdb my_prog
I hope this helps. Let me know if you are still experiencing problems.
Tim
jody wrote:
Hi
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
-------------------------
#!/bin/csh -f
echo "Running GDB on node `hostname`"
xterm -e gdb $*
exit 0
-------------------------
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?
Thanks
Jody
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