Interactive Shell(tmux)

The first step is to select the Interactive apps and then click the Shell(tmux) in the Open OnDemand dashboard.

Then you will see a form which needs to be filled to launch the interactive shell on compute nodes.

Partitions are work queues that has computational nodes in it to run the jobs. The partitions available in Discovery are interactive,normal, gpu, backfill, class, epscor, iiplab, cfdlab, so on.

However, you will see only the list of authorized partitions available for your Discovery account and hence, you won’t see the partitions which you don’t have authorization in the select dropdown.

Select one of the partitions where you want to submit your job. Refer to the page → Partitions in Discovery to select the ideal partition for your job.

By Default, partition is set to interactive.

Sets the Walltime for your job. The job gets killed if the Walltime you set gets elapsed.

Sets the Number of CPUs(Threads) for the job. The below table shows the maximum limit for CPU threads for each partition. The default and minimum value is 1 CPU thread.

Sets the memory for the job in terms of GB. The memory you select is available to all assigned threads for the job. The below table shows the maximum memory limit for each partition which can be requested for the job. The default and minimum value is 1 GB.

To enable the GPU selection, you need to choose one of the following partitions: interactive, class, gpu, epscor, iiplab, cfdlab. Only these partitions have GPUs and if you select any of the partitions, you can see the GPUs dropdown enabled.

If you want to get notified via email when the job starts/fails/ends, enter the email address associated with the Discovery account.

You can leave the text field blank if you don’t want job notifications.

Enable the checkbox if you want to use the Tmux Bundled config file included with the interactive app.

If the checkbox remains unchecked, tmux will look for the config file in the default locations($HOME/tmux.conf).

Once all the form fields are set, you can click the Launch button. The interactive session will be launched and you will see the below output.

The above output shows that the interactive Shell session has been launched successfully. You will see the Connect button only if the resources you have requested becomes available. Else, you might need to wait for some more minutes for the resources allocation and then the Connect button appears.

After it appears, click it.