Papers Published

1. Swaminathan, V; Schweizer, CB; Chakrabarty, K; Patel, AA, Experiences in implementing an energy-driven task scheduler in RT-Linux, Real Time Technology and Applications Proceedings (January, 2002), pp. 229-238, IEEE Comput. Soc [mostRecentIssue.jsp], [doi] .
   (last updated on 2022/12/30)

   Abstract:
   Dynamic voltage scaling (DVS) is being increasingly used for power management in embedded systems. Energy is a scarce resource in embedded real-time systems and energy consumption must be carefully balanced against real-time responsiveness. We describe our experiences in implementing an energy driven task scheduler in RT-Linux. We attempt to minimize the energy consumed by a taskset while guaranteeing that all task deadlines are met. Our algorithm, which we call LEDF, follows a greedy approach and schedules as many tasks as possible at a low CPU speed in a power-aware manner We present simulation results on energy savings using LEDF, and we validate our approach using the RT-Linux testbed on the AMD Athlon 4 processor. Power measurements taken on the testbed closely match the power estimates obtained using simulation. Our results show that DVS results in significant energy savings for practical real-life task sets. We also show that when CPU speeds are restricted to only a few discrete values, this approach saves more energy than currently existing methods. © 2002 IEEE.