Accessing

• Accessing the node's GPU

  Most of the time, you will want to use the node's gpu as a general purpose coprocessor or to render data that will be composited and displayed elsewhere. Use the shared display for this by configuring environment variables to set your DISPLAY and your XAUTHORITY. For example in tcsh use:

  setenv DISPLAY :0.0; setenv XAUTHORITY /var/gdm/\:0.Xauth

• Bringing the display back to your laptop

  You may want to bring the display from the submit node to your desktop. To do this, use ssh with X forwarding. If it doesn't automatically work, try running ssh -X vnodesub00 to use X forwarding.

  To bring a display back from a compute node, allocate the node using qsub as discussed in the section about submitting jobs and use a separate terminal and ssh connection with X forwarding to login into the compute node through vnodesub00. For example, try this in the first window:

  [fmccall@vnodesub00 ~]$ qsub -I
  qsub: waiting for job 134.vnodescheduler.umiacs.umd.edu to start
  qsub: job 134.vnodescheduler.umiacs.umd.edu ready
  		      

  In the second window, try:

  Fritz-McCalls-Computer:~ fmccall$ ssh -X vnodesub00
  fmccall@vnodesub00's password: 
  Last login: Wed Apr 12 23:38:57 2006 from somewhere.isp.com
  [fmccall@vnodesub00 ~]$ ssh -X vnode11
  Last login: Wed Apr 12 17:33:44 2006 from vnodesub00.umiacs.umd.edu
  [fmccall@vnode11 ~]$ xlogo
  

  You should see the X Logo on your local screen.

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