Another simpler (but not secure) option would be do run "xhost
+hostname" for each machine that you'll be using and then use un-
encrypted X connections to pipe back to your display. This avoids a
bunch of issues (e.g., the ssh to launch the MPI job quitting because
it successfully launched on the remote node) and is generally simpler.
On a closed LAN/cluster, it may be ok to do this... but your security
administrators may disagree with me. :-) I suggest that you check
with your admins.
Specifically, try something like this:
shell$ for host in `cat machines`; do xhost +$host: $host; done
This tells the X server to accept connections from all the hosts in
your machines file. Then you can mpirun with something like this:
shell$ mpirun --prefix /usr/local -hostfile machines \
-x DISPLAY=yourhost:0.0 -np 2 xterm -e gdb peruse_ex1
mpirun's -x option exports the environment variable listed, and the
"=foo" argument tells it to assign that value on the remote nodes.
Hence, the DISPLAY environment variable will be loaded with the value
"yourhost:0.0" on the remote nodes. Obviously, you need to replace
"yourhost:0.0" with the hostname and display number of the host that
you're launching from.
Hope that helps.
On Jan 1, 2008, at 1:40 PM, Doug Reeder wrote:
Krishna,
If you are using ssh to connect to the second machine you need to be
sure that ssh X11 forwarding is enabled and you may need to have mpi
use ssh -X or ssh -Y to connect to the second machine. That is how
the DISPLAY gets set using ssh.
Doug Reeder
On Jan 1, 2008, at 8:11 AM, Krishna Chaitanya wrote:
Hi,
I have been tracing the interactions between the
PERUSE and MPI library,on one machine. I have been using gdb along
with xterm to have two windows open at the same time as I step
through the code. I wish to get a better glimpse of the working of
the point to point calls, by launching the job on two machines and
by tracing the flow in a similar manner. This is where I stand as
of now :
mpirun --prefix /usr/local -hostfile machines -np 2 xterm -e gdb
peruse_ex1
xterm Xt error: Can't open display:
xterm: DISPLAY is not set
I tried using the display option for xterm and
setting the value as 0.0, that was not of much help.
If someone can guide me as to where the DISPLAY
parameter has to be set to allow the remote machine to open the
xterm window, it will be of great help.
Thanks,
Krishna
--
In the middle of difficulty, lies opportunity
_______________________________________________
users mailing list
us...@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/users
_______________________________________________
users mailing list
us...@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/users
--
Jeff Squyres
Cisco Systems
