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Accounts and Charging on JacquardIntroduction to MPP HoursWhen a job runs on a NERSC MPP system, such as Franklin, Bassi, or Jacquard, charges accrue against one of the user's repository allocations. A parallel job is charged for exclusive use of each multi-core/CPU node allocated to the job. The unit of accounting for these systems at NERSC is "MPP Hours." The MPP charge for a given job is calculated as the product of: (1) the job's wall-clock time in hours, (2) the number of CPUs allocated to the job (regardless of the number actually used), (3) a machine charge factor based on typical performance of the machine relative to the historical basis of the 375 MHz IBM Power3 architecture (MCF=1.0), and (4) and a job priority factor. Computing MPP Hours on JacquardJacquard's machine charge factor (MCF) is 3.6, and each node of Jacquard has two CPU's. Interactive, debug and regular priority batch jobs have a job priority factor of 1.0. Low priority batch jobs have a job priority factor of 0.5. Premium priority batch jobs have a job priority factor of 2.0. Interactive, debug and regular priority batch jobs are charged at the "regular" rate, which is 3.6 times the processor-hour. Low priority batch jobs are charged at half that rate. Premium priority charging is not available on Jacquard. For example, if you run an 32-node regular priority job on Jacquard that begins at 12:00:00 and ends 10 hours later at 22:00:00, your MPP charge is: 10 hours * 32 nodes * 2 CPUs/node * 3.6 MCF * 1.0 priority = 2,304 MPP Hours See MPP Charging for more details. Account information is available via the NIM web interface. |
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