Change in Allocation Metric and date adjustment

With the new implementation of SLURM for batch scheduling, CHPC will make the following adjustments to the allocation process. These were discussed and approved at the most recent Allocation Committee meeting:

• The Service Unit will be retired. Allocations and Usage reports will be measured and charged in wallclock core hours (e.g. one wallclock hour on the ember cluster will be charged 12 hours – there are 12 cores per node on ember).
• The Winter 2015 allocation period will be adjusted to include usage and allocation charges through April 2nd when the clusters are shut down for scheduled maintenance.
• The Spring 2015 allocation period will be adjusted to begin when scheduling resumes (using SLURM) after the April 2nd downtime.

The committee made an adjustment to the quick allocation:

• Quick allocation maximum request will be increased to 30,000 wallclock core hours

Prior allocations will not be adjusted; the SU’s awarded value will simply change to core wall clock hours. This will slightly oversubscribe our resources, but since most of our large allocations awards are submitted for the Spring 2015 renewal, the impact was judged to be within reason, and will smooth out over the next few quarters.  The allocation committee awarded hours based on availability in the new metric and consistently cut most awards by 25% to account for this change in measurement. For more information, please refer to:

• https://www.chpc.utah.edu/userservices/allocations.php
• https://www.chpc.utah.edu/documentation/policies/1.4AllocationPolicies.php

Please let us know if you have questions by sending email to issues@chpc.utah.edu.