Starting from quarter 04/2022, the two NHR centers

• NHR@ZIB and
• NHR@Göttingen

follow the NHR-wide regulations and account the resource usage in the new unit core hours.

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• A user accesses an account containing a number of units core hour.
• The NHR centers charge for batch jobs on the compute systems. The charge for a job is a number of units core hour.
• Usage of persistent storage including the tape library is are currently not accounted.

Charge

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Rates

The NHR centers operate different types of compute nodes (HLRN-IV system) organized in partitions, see Hardware. The charge rates for the partitions are given in the table.

Job

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Charge

The charge for a batch job on the NHR systems is the number of core hours and is calculated from the number of nodes reserved for the job, the wallclock time used by the job, and the charge rate for the job nodes. For a batch job with

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Account Types

Running batch jobs with a user account, the user can access different accounts in general. The NHR centers distinguish between

• personal accounts and
• project accounts

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Personal Account

In On the HLRN-IV systems, each user account is attached to a bank account containing core hours. Both accounts, the user account and the bank account, share the same name but their purpose is different. The user account is the account on of the Linux operation system and is used to control e.gfor authorization and access control incl. permissions to data files. The bank account is to limit the computing time.

At the beginning of each quarter, the bank account is granted by 75000 75.000 core hour  hours during the lifetime of the user account. In reasonable and exceptional cases, the grant of the bank account can be extended to 300 k core hourhours per quarter. For that, please contact your consultant. At the end of each quarter all remaining core hour hours in the bank account are dropped.

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A compute project holds a bank account for the project. This project account contains a compute capacity in core hourhours. At the beginning of each quarter the account is granted by the number of core hour hours following the funding decision for the given compute project. A project account holds at least 4x300 k core hourhours per year. Unused core hour hours are transferred to the subsequent quarter, but only one time.

In case of problems with your compute capacity in core hour hours in the your project account please look at /wiki/spaces/PUB/pages/425995 or contact your consultant. This might affect the

• application for additional core hourhours,
• movement of core hour hours between quarters.

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Select the Account in Your Batch Job

Batch jobs are submitted by a user account to the compute system. For each job the user chooses the account that will be charged by the job.

• For the user account the default account for compute time is defined on the link Informationen zu Ihrer Kennung/Account information of the service portal. At the beginning of the lifetime of the user account lifetime the default account is the personal account.

• The user controls the account for a job using the Slurm option --account at submit time.

To charge the account myaccount
add the following line to the job script. 
#SBATCH --account=myaccount

After job script submission the batch system checks the account for account coverage and authorizes the job for scheduling. Otherwise the job rejected., please notice the error message:

You can check the account of a job that is out of core hour.
> squeue
... myaccount ... AccountOutOfNPL ...

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