Difference between revisions of "HPRC:AMS:Functionality"
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Latest revision as of 10:15, 8 October 2021
Manage your accounts
Manage your granted computing time and report your usage with AMS. AMS allows you to flexibly manage the computing time you have been granted for each the different machines of our Supercomputing Facility upon approval of your application.
Computing time is granted and measured in service units (SUs). Each SU corresponds to 1 hour of wall clock time elapsed on 1 cpu-core by your application. The amount of resources used by your jobs is deducted from a project account.
A personal project account is created for each machine requested in your application when you apply for the first time. A project account allows you to keep track of all the SUs granted to you and used by you on a given machine. It is usually assigned to you for the duration of your project, but it expires at the end of each accounting period. Currently, an accounting period spans an entire school year, running from September 1st to August 31st of the next year. For such reason, we will refer to it as fiscal year (FY).
For your convenience, project accounts are tied to the reason of your request of computing time. Therefore, you may assign to your project account a description related to your intended usage of the machine. For instance, you may use the title of a personal research project, or mention a class you are attending, etc.
If you reapply in the near future for the same research project, you may be allowed to continue to use the same project account number assigned to you for that project during the previous accounting period.
If you are a Principal Investigator (PI), and you manage a group of users working on a single research project, you may transfer SUs to your researchers' project accounts using your AMS personal web interface. You may also reclaim your transferred SUs and redistribute them later on according to your needs.
You should always select which one of your project accounts you wish to use.
For your convenience, however, you may designate a primary project account, which will be used as your default account when you don't specify any account number. Currently, you may only set your primary account using the command line interface (myproject -d accountnumber).
If you have only one project account, then this account is automatically set as primary and your usage is deducted from it by default.
Once you submit a job to our batch system, AMS computes an amount in SUs based on the amount of resources (wall clock time and number of cpu cores) requested by your batch job file. The balance of your selected project account is then checked to determine if you have enough SUs left to accommodate this amount (This check is done for each job step included in your job command file on eos). If your available balance is large enough, the amount is posted to the project account as pending. Once your job has exited the batch system, this pending amount is dismissed and a new amount reflecting the actual usage is deducted as final.
If your project account does not contain enough SUs to satisfy what requested in your job command file, your job submission will be rejected by the batch system until your account will be replenished.
For such reason, we strongly encourage you to request an amount of resources very close to what you estimate your job will actually need.
Also, you will not be allowed to use the batch system after your project account has expired. However, you may continue to login on the system and work on your files until your login id expires.
Currently, the expiration date of your login id is set by default to October 1st.