Introduction

This guide assumes you have already received access to SeaWulf, and that you are able to log in. It serves to get you acquainted with the Open OnDemand platform you will be interacting with once you log in.
The SeaWulf OnDemand can be accessed from HERE. Currently, you must be connected to Stony Brook's campus network or the GlobalProetect VPN to access SeaWulf OnDemand. 

Open OnDemand

Via Open OnDemand, SeaWulf is now available from your browser allowing you to access SeaWulf even from your phone or tablet. There are no needs for SSH set up or SSH tunneling for Jupyter notebooks and RStudio Servers. Open OnDemand also allows users to access desktops on SeaWulf nodes in interactive sessions, instead of navigating through the text-only platforms. 

Logging In

Use your NetID as your username and log in with your NetID Password. Once you enter your credentials, you may be directed a DUO authentication.
The Division of Information Technology offers the DUO service page, which can be referred to for additional information regarding this service.

SeaWulf OnDemand

Once logged in, your screen will show the dashboard:

To use any apps pinned on the portal, simply click on the icons and follow the instructions shown on the directed pages.
Below are walk-through of how to utilize some of the apps on SeaWulf OnDemand.

JUPYTER NOTEBOOK

To use Jupyter Notebook, simply click on the icon on the main page or click on Interactive Apps on the top navigation bar and select Jupyter Notebook under Servers. You will be directed to the setting page for Jupyter Notebook.

To set up the notebook, choose an appropriate queue and adjust the number of requested hours for the session. Account field can be left blank unless there is a different SLURM account you wish to submit the job under. Number of nodes should be kept to 1, unless using parallelization requiring more. If the waiting time is long, you can enable email notification. An email will be sent to your Stony Brook account or the email associated with your NetID once the session is ready.
Please keep in mind that the more resources you request, the longer you might have to wait in queue before having resources allocated to you. 

Jupyter notebook will only have access to your home directory. If you are interested in accessing files outside of the home directory, please create a symlink from that directory to home directory. For example, to create a symlink to your scratch directory, please run the following on SeaWulf, replacing NetID with your NetID:

ln -s /gpfs/scratch/NetID /gpfs/home/NetID

A symlink with your NetID as the name will be created in your home directory. More information on ln command can be found by running the following on your command line: -ln --help

Once you click on Launch, the page will refresh to show three general status: Queued, Starting, and Running.

Once your job allocated a node, the status on screen will update to Starting. Once it is ready for use, it will update to Running and a button, Connect to Jupyter, will appear as shown below. Click on it to access Jupyter Notebook. From here, using Jupyter Notebook is the same as on any other platform.

Once you are done with the session, close the tab with Jupyter and click on Delete on the status page to kill the job. Then, confirm. 

The same steps can be applied to RStudio Server. 

MATLAB

To use MATLAB, simply click on the icon on the main page or click on Interactive Apps on the top navigation bar and select MATLAB under GUIs. 

To set up the MATLAB, choose a MATLAB version, an appropriate queue, and adjust the number of requested hours for the session. Account field can be left blank unless there is a different SLURM account you wish to submit the job under. Number of nodes should be kept to 1, unless using parallelization requiring more. If the waiting time is long, you can enable email notification. An email will be sent to your Stony Brook account or the email associated with your NetID once the session is ready.
Please keep in mind that the more resources you request, the longer you might have to wait in queue before having resources allocated to you. 

Once you click on Launch, the page will refresh to show three general status: Queued, Starting, and Running.  
When the job is running, a page like below will show. From here, you can launch MATLAB, adjust compression and image quality, and retrieve view only share-able link. With the share-able link, anyone with a SeaWulf account can view your MATLAB from their browser and copy contents shown.

Once you Launch MATLAB, a new tab containing a MATLAB window will open as shown below. From here, using MATLAB is the same as on any other platform.

When you are done, close the tab, click on delete on the status page, and confirm on the pop-up window.

JOB COMPOSER

To run and submit an automated or non-interactive job, Job Composer can be used.
To access Job Compoer, click on the icon on Dashboard or select Job Composer under Jobs on the top navigation bar. You will be directed to a Jobs setting page:

If this is your first time accessing this page, instructions to assist you will appear, as shown above. Click on New Job at the top left corner and select one of the options. If you already have a job script and a directory where all the necessary files are stored, select From Specified Path. Provide the source path and hit Save. The optional information can be edited by clicking on Job Options once you return to the Job Composer main page. By selecting From Default Template, a new job utilizing MPI will be created on the list, and a setting column will show as below:

To change the content of the script file, click on the file name of the script under Folder Contents or the Open Editor at the bottom of the page. A text editor will open in a new tab as shown below. Make changes to the file as you would format any job script. Settings such as text size, theme, and mode can be changed on the navigation bar on the top right. Once you are done editing, click on the Save button at the top left to save. The changes will be saved and reflected on the applicable files stored on SeaWulf.

There are two ways to edit the directory and its contents from the Job Composer. You can click on the white Open Terminal button at the bottom right of the page to edit the directory from a terminal. A new tab with a terminal with the initial directory as the specified directory for your job will open. Please note that you may need to authorize a DUO notification before accessing. 
If you prefer a graphic interface, click on the blue Edit Files button at the top left of the page or the blue Open Dir button also at the bottom right of the page. A new tab will open as below:

From here, you can manipulate the contents of the directory by creating new files and directories, uploading and downloading files to and from the machine you are connecting to OnDemand with, and selecting a file to copy or move from the directory. To access this page, you can also click on the Home Directory icon on the Dashboard or click on Home Directory under Files on the top navigation bar. This page can be opened for any directory in your SeaWulf account by changing the source path at the clicking on the Change Directory button in the middle of the page. 

Once the directory and the script is ready to go, go back to the Job Composer main page and click Submit at the middle of the page. To pause a job, click on Stop. To delete a job from the job list, click on Delete.

RUNNING AN INTERACTIVE JOB

To run an interactive job aside from MATLAB, Jupyter Notebook and RStudio Server, SeaWulf Desktop or SeaWulf Cluster Shell Access can be used.

SeaWulf Desktop 

To access the Desktop version of SeaWulf nodes, click on the icon on Dashboard or select SeaWulf Desktop under Interactive Apps on the top navigation bar. You will be directed to a SeaWulf Desktop setting page:

To  set up your job, choose an appropriate queue and Desktop Environment for the job and adjust the number of hours you would like the session to last for. Account field can be left blank, unless there is a different SLURM account you wish to submit the job under. Number of nodes should be kept to 1, unless utilizing parallelization requiring more. If the waiting time is long, you can enable email notification. An email will be sent to your Stony Brook account or the email associated with your NetID once the session is ready.

Please keep in mind that the more resources you request, the longer you might have to wait in queue before having resources allocated to you. 

Once you click on Launch, the page will refresh to show three general status: Queued, Starting, and Running.

Once the job is running, a page like below will show. From here, you can launch the SeaWulf Desktop, adjust compression and image quality, and retrieve view only share-able link.

With the share-able link, anyone with a SeaWulf account can view your SeaWulf desktop from their browser and copy contents shown.

Once you Launch SeaWulf Desktop, you may be prompted to enter your password under your name. Simply type in your NetID password to unlock. Then, a new tab showing a Linux Desktop where you can interact with will open.

To access the command line, double click on the black icon at the bottom of the page or select Terminal Emulator under Applications on the top navigation bar. 

When you are done, close the tab, click on delete on the status page, and confirm on the pop-up window.

SeaWulf Cluster Shell Access

To access the terminal or shell, use the SeaWulf Cluster Shell Access by clicking on the icon on the main page or clicking on Clusters on the top navigation bar and selecting SeaWulf Cluster Shell Access.

You will be directed to a shell, where you will be prompted for your DUO authentication. After approving the prompt, you will be able to use the terminal as if you are accessing SeaWulf from your terminal via SSH. You will be able to request interactive job sessions as you would do outside of Open OnDemand. 

Once you are done, simply close the tab.

More details and official documentation on Open OnDemand can be found here.