To know more about on how to Use Interactive Sessions in OnDemand please click here.

Faculty Cluster Desktop - Advanced Options        

This app will launch an interactive desktop on one or more compute nodes in the faculty cluster.  You must have access to this cluster or your job will not run. The longest allowable wall time for these nodes varies from 72 hours but some allow up to 30 days depending on the partition. It is recommended that you enter only the time you need to run your job rather than use the default.



  1. Slurm Account: Your default Slurm account will be used if nothing else is entered.  To see what Slurm accounts you have access to, use the 'slimits' command in a terminal window.
  2. Partition: Use the drop-down bar to make a selection for partition.  The 'slimits' command will show you what you have access to. 
  3. QOS: Quality of Service value - select the same as the partition name. 
  4. Number of hours: Most partitions have a max wall time of 72 hours but some allow up to 30 days.
  5. Number of nodes: Only select more than one node if you're sure your program can run on multiple nodes.
  6. Number of cores: Only select more than one core if you're sure your program can run on multiple CPUs.
  7. Node Features: All nodes have tags to distinguish various hardware types.  Use the command  'snodes all faculty/partition_name' in a terminal window to see available tags
  8. Amount of memory per node: If not specified, Slurm will allocate the minimum amount of RAM for your job, based on the type of node selected and the number of cores requested.  If your job requires more than this, specify the amount in MB.
  9. Exclude host: If you want to ensure your job doesn't run on a specific node, enter the node short name here.  This is in the form of: cpn-rack#-u# i.e. cpn-u22-01


In this example, we've started up an Faculty Cluster Desktop - Advanced Options .  Once you click the Launch button, you will be redirected to the session information where you can see the status of the job.  This one is queued:


If you have elected to receive an email when your job starts, you can leave the CCR OnDemand portal until the email arrives and then log back in to open your session.  


When a session is ready to launch, it will look like this in the Interactive Sessions section of CCR OnDemand:

Click on the blue "Launch Faculty Cluster Desktop - Advanced Options" button and you will see your desktop window on the node you've been allocated:




You are now logged into an interactive desktop session and onto a node in the CCR faculty cluster.  You can begin your work!  



If this is your first time starting an interactive desktop session, you may be prompted with this pop-up:



Please click "Use default config"



NOTE: If your session starts and does not display a menu or icons on the bottom (as shown in these screenshots), check out this troubleshooting article



To start a terminal window, click on the window icon at the bottom of your screen, shown here:




This is a terminal window and where you will type all of your commands.  If you are unfamiliar with UNIX commands, we recommend you view the following articles:

Basic UNIX

UNIX File Transfer


To learn more about launching GUIs for COMSOL, MATLAB, StarCCM, and ABAQUS click here.


For information about where files are stored, how to check your quotas, and how to purchase additional storage, please see:

Storage and Quotas


All software available for use on CCR servers is listed here:

Current Software Information

How do I install software?


Still unsure what to do next?  Schedule an appointment with one of our computational scientists for a training session by submitting a help request.


To know more about deleting a running session click here.