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Project account
NHR center NHR@ZIB follows NHR-wide regulations and account the resource usage in the unit core hours.
Both NHR centers provide computational resources primarily to universities in Germany under public law.
- 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 hourA User Account accesses a project account containing units of core hour. A project account can be a Test Project or a Compute Project.
- A batch job on the compute system is charged by a number of core hour to measure the usage.
- Usage of persistent storage including the tape library are currently not accounted.
Charge
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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.
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standard96
standard96:test
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large96
large96:test
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rates
NHR@ZIB operates system Lise with different Compute partitions. Properties for available (slurm-)partitions you find on the pages
Each partition holds a specific charge rate.
| Compute partition | Slurm partition | Charge (core hour) per 1 node per 1 h occupancy time | Remark |
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cpu-clx | 96 | ||
| cpu-clx:test | |||
| cpu-clx:ssd | |||
cpu-clx:large | 144 | high memory layouthuge96 | |
| cpu-clx:huge | 192 | high memory layout medium40 medium40 | |
| CPU Genoa partition | cpu-genoa cpu-genoa:test | 40 | |
large40 large40:test | 80 | high memory layout | |
gpu | 375free of charge1 | test phase | |
| GPU A100 partition | gpu-a100 | 600 | four NVidia V100 A100 (32 80 GB) GPUs per compute node |
grete | 600 | four NVidia A100 (40 GB) | |
gretegpu-a100:shared | 150 per GPU | 600 : for four NVidia A100 (40 GB) per node | |
grete:interactive grete:preemptible | 47 gpu-a100:shared:mig | 21.43 per MiG slice | four NVidia A100 (40 80 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) |
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| GPU PVC partition | gpu-pvc | free of charge1 | test phase |
1: Practically the charge is a very small number (close to zero).
Job charge
The charge of core hours for a batch job depends 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 nodespartition used. For a batch job with
num a number of nodes n,
running with a wallclock time of t hours, and
- on a partition with a charge rate charge_p
the job charge charge_j yields
charge_j = numn * t * charge_p
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A job on 10 nodes running for 3 hours on partition huge96 (= 192 core hour) yields a job charge of 5760 core hour. |
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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
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- 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.
In case of problems with your compute capacity in core hours in your project account please contact your consultant. This might affect the
- 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.
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 the default account is the personal account.
The user controls the account for a job using the Slurm option --account at submit time.
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To charge the account myaccount
add the following line to the job script.
#SBATCH --account=myaccount
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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:
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| You can check the account of a job that is out of core hour. > squeue ... myaccount ... AccountOutOfNPL ... |