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Visualization on computational nodes

X11 forwarding is available on the compute and GPU nodes of Elja. To use this feature a few steps are needed to create a "double tunnel" that looks something like this:

compute-node -> login-node -> local-machine
  1. First, connect with the -XY flag as stated in previous chapters or using XLaunch with PuTTy.
  2. Using srun allocate and connect to a compute node with the x11 flag set.
srun -n 1 --partition 48cpu_192mem --x11 --pty bash

You should now be connected to a compute node. Given that you have loaded some GUI program you will be able to run that on the compute node.

Example:​

For this example a user will run the graphical program QGIS (an Open-Source Geographic Information System).

[user ~] ssh -XY user@elja.hi.is
[user@elja-irhpc ~]$ ml load QGIS
[user@elja-irhpc ~]$ srun -n 1 --partition gpu-1xA100 --x11 --pty bash
[user@gpu-2 ~]$ qgis # QGIS now opens up on my local machine