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Dynamic I/O power management for hard real-time systems

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3 Author(s)
V. Swaminathan ; Dept. of Electr. & Comput. Eng., Duke Univ., Durham, NC, USA ; K. Chakrabarty ; S. S. Iyengar

Power consumption is an important design parameter for embedded and portable systems. Software-controlled (or dynamic) power management (DPM) has recently emerged as an attractive alternative to inflexible hardware solutions. DPM for hard real-time systems has received relatively little attention. In particular energy-driven I/O device scheduling for real-time systems has not been considered before. We present the first online DPM algorithm, which we call Low Energy Device Scheduler (LEDES), for hard real-time systems. LEDES takes as inputs a predetermined task schedule and a device-usage list for each task and it generates a sequence of sleep/working states for each device. It guarantees that real-time constraints are not violated and it also minimizes the energy consumed by the I/O devices used by the task set. LEDES is energy-optimal under the constraint that the start times of the tasks are fixed. We present a case study to show that LEDES can reduce energy consumption by almost 50%

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Hardware/Software Codesign, 2001. CODES 2001. Proceedings of the Ninth International Symposium on

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