XGrid does not forward X11 credentials, so you would have to setup an
X11 environment by yourself. Using ssh or a local starter does
forward X11 credentials, which is why it works in that case.
Brian
On Oct 25, 2007, at 10:23 PM, Jinhui Qin wrote:
Hi Brian,
I got another problem in running an MPI job through XGrid.
During the execution of this MPI job it will call Xlib functions
(i.e. XOpenDisplay()) to open an X window. The XOpenDisplay()
function call failed (return "null"), it can not open a display no
matter how many processors that I requested.
However, when I tuned off the xgrid controller, I used "mpirun -n 4
" to start the job again, four X windows opened properly, but four
processes were all running on the local machine instead of on any
remote nodes.
I have also tested to use "ssh -x" from a terminal of my local
machine to login to any other node in the cluster to run the job
(I have the copies of the same job on all nodes and in the same
path), the X window can display on my local machine properly. I
know it is "-x" option set up the environment properly for starting
the xwindow. If only use "ssh" without "-x" option, it won't work.
I am wondering why the xwindow can not open if the job is started
through Xgrid. How does the Xgrid controller contact to each agent
node?
Is there anyone who has seen a similar problem?
I have installed X11 and OpenMPI on all 8 mac mini nodes in my
cluster, and have also tested running an MPI job, which has no X
window function calls, through XGrid, it worked perfectly fine on
all nodes.
Thanks a lot for any suggestions!
Jane
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