*** Under construction ***
HPC clusters and supercomputers resources are accounted in either corehours or nodehours (and more generally CPUhours). One corehour is equal to one core used for one wallclock hour computed from the time the core is allocated to the time it is deallocated.
The total resource available is computed by multiplying the total amount of nodes available for computations by the total allocation time in hours. For instance, a 400node cluster will provide 400*24*365 = 3'504'000 nodehours over one year.
Users are typically given a percentage of the total resource, which has a nodehours equivalent. For instance, 10% of the HPC cluster means 40node hours over 1 year = 350'400 nodehours.
use workload manager to dispatch jobs. Resources
The fairshare algorithm in SLURM is described at http://slurm.schedmd.com/fair_tree.html.
SCITAS machines have a halflife of one week. 
To see the share for your group you can use the "Sshare" command"
$ Sshare Account User Raw Shares Norm Shares Raw Usage Norm Usage Effectv Usage FairShare Level FS          scitasge 1 0.007752 1376 0.000003 0.000005 1468.763590 scitasge aubort 1 0.043478 0 0.000000 0.000000 0.290000 inf scitasge clemenco 1 0.043478 0 0.000000 0.000000 0.290000 inf scitasge cubuk 1 0.043478 0 0.000000 0.000000 0.290000 inf scitasge culpo 1 0.043478 0 0.000000 0.000000 0.290000 inf scitasge degiorgi 1 0.043478 0 0.000000 0.000000 0.290000 inf scitasge eroche 1 0.043478 344 0.000001 0.250000 0.253333 0.173913 scitasge nvarini 1 0.043478 0 0.000000 0.000000 0.290000 inf scitasge qubit 1 0.043478 351 0.000001 0.255072 0.250000 0.170455 scitasge rezzonic 1 0.043478 681 0.000001 0.494928 0.246667 0.087848 scitasge richart 1 0.043478 0 0.000000 0.000000 0.290000 inf scitasge rmsilva 1 0.043478 0 0.000000 0.000000 0.290000 inf scitasge sue 1 0.043478 0 0.000000 0.000000 0.290000 inf scitasge topf 1 0.043478 0 0.000000 0.000000 0.290000 inf 
The "Norm Shares" column on the first line is the proportion of the cluster which is allocated to the account and the shares are in terms of cores. Within a group all users have equal weight and so 1 share each.
The value used to decide the priority of a job is the "Level FS" and this is calculated based on the difference between the "Norm Shares" and "Effectv Usage" values. The higher the Level FS, the higher the priority.
A Level FS of less than 1 represents overconsumption. More than 1 means you are underconsuming.
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