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Resource Sharing on Commodity Clusters

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Jobs on OLCF clusters are scheduled in full node increments; a node’s cores cannot be allocated to multiple jobs. Because the OLCF charges based on what a job makes unavailable to other users, a job is charged for an entire node even if it uses only one core on a node. To simplify the process, users are given a multiples of entire nodes through PBS.

Note: Users are given a multiples of entire nodes through PBS, and associated allocations are reduced by the number of nodes requested, regardless of actual CPU utilization.