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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 (24 cores)
for 1 hour amounts to 24 wall-clock core-hours.
### Standard Core-Hours SCH
The resources subject to accounting are the standard core-hours (SCH).
The standard core-hours are obtained from WCH by applying a standardization factor:
---8<--- "sch_formula.md"
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. All jobs are accounted in standard 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 |
!!! note
The allocations are requested/granted in standard core-hours SCH.
Whenever the term core-hour is used in this documentation, we mean the standard core-hour, SCH.
The standard core-hours were introduced to treat systems of different age on equal footing.
Standard 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
User may check at any time, how many core-hours have been consumed by himself/herself and his/her projects. The command is available on cluster login nodes.
```console
$ it4ifree
Projects I am participating in
==============================
PID Days left Total Used WCHs Used SCHs WCHs by me SCHs by me Free
---------- ----------- ------- ----------- ----------- ------------ ------------ -------
OPEN-XX-XX 323 0 5169947 5169947 50001 50001 1292555
Projects I am Primarily Investigating
=====================================
PID Login Used WCHs Used SCHs
---------- ---------- ----------- -----------
OPEN-XX-XX user1 376670 376670
user2 4793277 4793277
Legend
======
WCH = Wall-clock Core Hour
SCH = Standard Core Hour
```
The **it4ifree** command is a part of it4i.portal.clients package, located here: <https://pypi.python.org/pypi/it4i.portal.clients>