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IDT Open Seminar: Guaranteeing Real-time Properties using Energy Manipulation
Traditionally energy management techniques, mainly Dynamic Voltage and Frequency Scaling (DVS), have focused on slowing down task executions and/or reduce the operating voltage to minimize energy consumption. However slowing down task executions and/or reducing the operating voltage could have detrimental effects on the real-time system. One of the effects of the traditional DVS techniques is the increase in the number of preemptions in the real-time schedule. Preemptions are known to increase the task Worst Case Execution Times (WCET) by 30-40% causing the task execution times to be unpredictable. Another effect of the traditional DVS techniques on the real-time system is the increase in fault rates decreasing the reliability of the system. We discuss the use of DVS to control the preemptions in the real-time schedule for periodic and sporadic task systems. We also have an open discussion on how DVS could be used to influence other properties of the real-time system in order to achieve a certain desired goal.