The Open OnDemand Job Composer enables users to create job scripts and submit them without ever using the command line. This is paricularly helpful for new users who have never opened a terminal or are unfamiliar with Linux command line behavior. However, some knowledge of Slurm and ARCC’s required Slurm directives is needed to successfully submit jobs on MedicineBow. Discussed in this module section of the workshop is the use of the Job Composer and common issues that arise with it.
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When we click the light blue button on the bottom of the right box, we get a new window to pop up with a text editor-like appearance. If we then look at ARCC’s documentation on Required Inputs, we know what to add to get a job to run by adding the account and time Slurm directives.
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If we click save and go back to the Job Composer page, we should see our changes in the preview.
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Job Options
Now that our job will run, we still might need to make some changes to the job options that will work best for us. If we click the “Job Options”
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Job Submission
With all of the edits made, we can now submit the job to the cluster to run. The steps to do so are:
If we refresh the page, we see in the left box that this simple job has been completed and a file for our output was created on the right box |   |
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In Conclusion
This module was a simple tutorial for using the Job Composer in Open OnDemand. This tool helps to send jobs to the MedicineBow cluster without the need for using a terminal. That said, the concepts for job submission with Slurm still apply to this tool and it is important to understand what each are doing, but most importantly:
ARCC’s required inputs
Other Slurm directives that are important to the success of the job
How to use Lmod to load software
Awareness of where the locations on the system where the script is created and output are placed
If used wisely, the Open OnDemand Job Composer can be an easy-to-use tool for creating jobs on MedicineBow and the other tutorials on Intro to Linux, Text Editors, Lmod, and Job Submission are extremely beneficial for the successful use of the tool.
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Finally The End
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