diff --git a/docs.it4i/snippets/resource_accounting.md b/docs.it4i/snippets/resource_accounting.md index 611be3992fba56c02830074c3f2d45bb6fc52a60..9d6105b889341e9d0e1d0be89a6727d0bb962514 100644 --- a/docs.it4i/snippets/resource_accounting.md +++ b/docs.it4i/snippets/resource_accounting.md @@ -3,28 +3,33 @@ ### 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. +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). ### 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" +$$ +SCH = F*WCH +$$ -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: +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. +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. -Whenever the term core-hour is used in this documentation, we mean the standard core-hour, SCH. + + +!!! 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. @@ -34,7 +39,7 @@ See examples in the [Job submission and execution](job-submission-and-execution/ ### 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. +Check how many core-hours have been consumed. The command it4ifree is available on cluster login nodes. ```console $ it4ifree