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Starting with the 24<sup>th</sup> open access grant competition, the accounting policy has been changed from [normalized core hours (NCH)][2a] to **node-hours**. This means that it is now required to apply for node hours of the specific cluster and node type:
1. [Barbora FAT][5a]
1. [DGX-2][6a]
1. [Karolina CPU][7a]
1. [Karolina GPU][8a]
1. [Karolina FAT][9a]
The accounting runs whenever the nodes are allocated via the PBS Pro workload manager (the qsub command), regardless of whether
the nodes are actually used for any calculation.
| Barbora CPU | 36 core-hours |
| Barbora GPU | 4 GPU core-hours |
| Barbora FAT | 128 core-hours |
| DGX-2 | 16 GPU core-hours |
| Karolina CPU | 128 core-hours |
| Karolina GPU | 8 GPU core-hours |
| Karolina FAT | 768 core-hours |
## Original Resource Accounting Policy
The original policy, as stated below, is still applied to projects from previous grant competitions.
### Wall-Clock Core-Hours WCH
The wall-clock core-hours (WCH) are the basic metric of computer utilization time.
1 wall-clock core-hour is defined as 1 processor core allocated for 1 hour of wall-clock time. For example, allocating a full node (i.e. 36 cores) on Barbora for 1 hour amounts to 36 wall-clock core-hours.
### Normalized Core-Hours NCH
The resources subject to accounting are the normalized core-hours (NCH).
The normalized core-hours are obtained from WCH by applying a normalization factor:
$$
NCH = F*WCH
$$
All jobs are accounted in normalized core-hours, using factor F valid at the time of the execution:
| System | F | Validity |
| --------------| ---: | -------- |
| Karolina | 1.00 | 2021-08-02 to 2022-09-06 |
| Barbora CPU | 1.40 | 2020-02-01 to 2022-09-06 |
| Barbora GPU | 4.50 | 2020-04-01 to 2022-09-06 |
| DGX-2 | 5.50 | 2020-04-01 to 2022-09-06 |
The normalized core-hours were introduced to treat systems of different age on equal footing.
Normalized core-hour is an accounting tool to discount the legacy systems.
Check how many core-hours have been consumed. The command `it4ifree` is available on cluster login nodes.
```console
$ it4ifree
Projects I am participating in
==============================
PID Days left Total Used WCHs Used NCHs WCHs by me NCHs by me Free
---------- ----------- ------- ----------- ----------- ------------ ------------ -------
OPEN-XX-XX 323 0 5169947 5169947 50001 50001 1292555
Projects I am Primarily Investigating
=====================================
PID Login Used WCHs Used NCHs
---------- ---------- ----------- -----------
OPEN-XX-XX user1 376670 376670
user2 4793277 4793277
Legend
======
WCH = Wall-clock Core Hour
NCH = Normalized Core Hour
```
The `it4ifree` command is a part of the `it4i.portal.clients` package, located [here][pypi].
[1a]: job-submission-and-execution.md
[2a]: #normalized-core-hours-nch
[3a]: ../../barbora/compute-nodes/#compute-nodes-without-accelerators
[4a]: ../../barbora/compute-nodes/#compute-nodes-with-a-gpu-accelerator
[5a]: ../../barbora/compute-nodes/#fat-compute-node
[6a]: ../../dgx2/introduction/
[7a]: ../../karolina/compute-nodes/#compute-nodes-without-accelerators
[8a]: ../../karolina/compute-nodes/#compute-nodes-with-a-gpu-accelerator
[9a]: ../../karolina/compute-nodes/#data-analytics-compute-node
[pypi]: https://pypi.python.org/pypi/it4i.portal.clients