Ramp rate limiting: controlling the rate of change in power consumption in the lifecycle of a job. Cray provides a capmc control knob to set C-state limits and sleep state limit. Delivering the delta in power consumption for each CPU is too expensive, cannot be delivered. Cray will provide an optional configuration to record (and retrieve) the maximum "delta"/"ramp" for the whole system. The sysadmin sets the allowed delta/ramp. Ramp limiting can be "simplified": for example setting a constant sleep state limit will keep the system to spike down. Similarly, setting a minimum could be used to avoid ramp up in the power consumption. A core changes C-state every few microseconds: C-0 is the maximum power consumption state, the "idler" the core becomes the deeper the C-state it goes (C-1, C-2, ...C-6).