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## Resource Accounting Policy
### 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. Allocating a full node (16 cores Anselm, 24 cores Salomon)
for 1 hour amounts to 16 wall-clock core-hours (Anselm) or 24 wall-clock core-hours (Salomon).
The resources subject to accounting are the normalized core-hours (NCH).
The normalized core-hours are obtained from WCH by applying a normalization factor:
All jobs are accounted in normalized core-hours, using factor F valid at the time of the execution:
| System | F | Validity |
| ------------------------------- | - | -------- |
| Salomon | 1.00 | 2017-09-11 to 2018-06-01 |
| Anselm | 0.65 | 2017-09-11 to 2018-06-01 |
The accounting runs whenever the computational cores are allocated via the PBS Pro workload manager (the qsub command), regardless of whether
the cores are actually used for any calculation.
*The allocations are requested/granted in normalized core-hours NCH.
Whenever the term core-hour is used in this documentation, we mean the normalized core-hour, NCH.
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. The past (before 2017-09-11) F factors are all 1.0.
In future, the factors F will be updated, as new systems are installed. Factors F are expected to only decrease in time.
See examples in the [Job submission and execution](job-submission-and-execution/) section.
### Consumed Resources
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
=====================================
---------- ---------- ----------- -----------
OPEN-XX-XX user1 376670 376670
user2 4793277 4793277
Legend
======
WCH = Wall-clock Core Hour
```
The **it4ifree** command is a part of it4i.portal.clients package, located here: <https://pypi.python.org/pypi/it4i.portal.clients>