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From: Brian Barrett (brbarret_at_[hidden])
Date: 2007-10-26 00:33:04

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.


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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