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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 are currently not accounted.
Charge Rates
The NHR centers operate different types of compute nodes (Lise and Emmy) organized in partitions, see Compute Partitions. The charge rates for the partitions are given in the table.
| one node in partition | charged "core hours" per 1h occupancy time | increased charge rate due to |
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standard96 standard96:test | 96 | |
large96 large96:test large96:shared | 144 | high memory layout |
| huge96 | 192 | high memory layout |
medium40 medium40:test | 40 | |
large40 large40:test | 80 | high memory layout |
gpu | 375 | four NVidia V100 (32 GB) GPUs per node |
grete | 600 | four NVidia A100 (40 GB) |
grete:shared | 150 per GPU | 600: four NVidia A100 (40 GB) per node |
grete:interactive grete:preemptible | 47 per MiG slice | four NVidia A100 (40 GB) splitted each into two 2g.10gb slices (8 per node and currently 24 in total) and one 3g.20gb slice (4 per node and currently 12 in total) |
Job 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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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. |
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
Personal Account
On the NHR 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 of the Linux operation system and is used for 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 75.000 core 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 hours per quarter. For that, please contact your consultant. At the end of each quarter all remaining core hours in the bank account are dropped.
Project Account
A compute project holds a bank account for the project. This project account contains a compute capacity in core hours. At the beginning of each quarter the account is granted by the number of core hours following the funding decision for the given compute project. A project account holds at least 4x300 k core hours per year. Unused core hours are transferred to the subsequent quarter, but only one time.
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- application for additional core hours,
- movement of core hours between quarters.
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.
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