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- A user accesses an NPL account containing a number of NPL (Norddeutsche Parallelrechner-Leistungseinheit/north-german parallel-computer work unit).
- HLRN charges for batch jobs on the compute system. The charge for a job is a number of NPL.
- Usage of magnetic tapes or hard disk capacity is currently not accounted.
Charge rates
The HLRN operates different types of compute nodes (HLRN-IV system) organized in partitions, see Hardware. The charge rates for the partitions are given in the table.
| Partition | NPL/node-hour |
|---|---|
standard96 standard96:test | 14 |
large96 large96:test large96:shared | 21 |
| huge96 | 28 |
medium40 medium40:test | 6 |
large40 large40:test | 12 |
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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| Panel | ||
|---|---|---|
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A job on 48 cores on partition large96:shared (96 cores per node, 21 NPL/node/hour) has a reservation for num = 48/96 = 0.5 nodes. Assuming a wallclock time of 3 hours yields a job charge of 31.5 NPL. |
CPUh and NPL relation
Depends on the core/node type and the number of physical cores used per node:
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1 NPL ~ 6.857 cpuh (standard96)
NPL accounts
Running batch jobs with a user account, the user can access different NPL accounts in general. HLRN distinguishes between
- personal accounts and
- project accounts
User account
In the HLRN each user account is attached to a personal NPL 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 NPL.
At the beginning of each quarter the personal account is granted by 10000 NPL during the lifetime of the user account. In reasonable and exceptional cases, the grant of the personal account can be extended to 40000 NPL per quarter. For that please contact your consultant. At the end of each quarter all remaining NPL in the personal account are dropped.
Project account
A HLRN compute project holds a project NPL account. The project account is a bank account containing NPL for the project.
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- application for additional NPL,
- movement NPL 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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