Starting from quarter 04/2022, the two NHR centers
- NHR@ZIB and
- NHR@Göttingen
follow the NHR-wide regulations and account in the new unit core hours.
Both NHR centers provide computational resources primarily to universities and scientific institutions in Germany under public law.
The details regarding the policies for resource allocation and payment are prescribed by the Fees And Regulations on the HLRN webpage Zulassungs- und Entgeltordnung considering the unit conversion 1 NPL = 6.86 core hour.
- 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 magnetic tapes or hard disk capacity is currently not accounted.
Charge 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.
| one node in partition | core hourhours per 1h occupancy time |
|---|---|
standard96 standard96:test | 96 |
large96 large96:test large96:shared | 144* |
| huge96 | 192* |
medium40 medium40:test | 40 |
large40 large40:test | 80* |
*increased accounting due to high memory layout
Job charge
The charge for a batch job on a HLRN system is a number of NPLs 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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A job on 48 cores on partition large96:shared (96 cores per node, 144 core hour) has a reservation for num = 48/96 = 0.5 nodes. Assuming a wallclock time of 3 hours yields a job charge of 216 core hour. |
Accounts for core hour
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
User account
In the HLRN each user account is attached to a personal account. Both accounts, the user account and the personal account, share the same name but their purpose is different. The user account is the account on the Linux operation system and is used to control e.g. permissions to data files. The personal account is a bank account containing core hour.
At the beginning of each quarter the personal account is granted by 75000 core hour during the lifetime of the user account. In reasonable and exceptional cases, the grant of the personal account can be extended to 300 k core hour per quarter. For that please contact your consultant. At the end of each quarter all remaining core hour in the personal account are dropped.
Project account
A compute project holds a project account. The project account is a bank account containing core hour for the project. At the beginning of each quarter the account is granted by the number of core hour following the funding decision for the compute project. Unused core hour are transferred to the subsequent quarter, but only one time.
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- application for additional core hour,
- movement of core hour between quarters.
Batch job and account
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.
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