Real Time Scheduling for CPU and Hard Disk Requirements-Based Periodic Task with the Aim of Minimizing Energy Consumption

−In recent years, with an increasing number of\udrequests, energy, power and temperature have been\udimportant keys in embedded systems, which decrease the\udlifetime of both CPUs and hard disks. The energy\udconsumption is an important issue in computer systems,\udparticularly real-time embedded systems. The frequency\udand the Revolutions Per Minute are major factors in the\udreduction of energy consumption in both processors and\udhard disk drives. Therefore, the main goal of this paper is\udto present a scheduling mechanism for a real time\udperiodic task that can save more energy. This mechanism\udis based on increasing, as much as possible, the execution\udtime of the CPU and/or the Read/Write time of the hard\uddisk without passing the task deadline. This will be done\udby dynamically changing the CPU frequency and/or the\udRPM of hard disk. Our experimental results demonstrate\udthat the proposed algorithm manages to lower energy\udconsumption by an average of 25% and to reduce the\udnumber of missed tasks by 80%