An approach for a reduced response time and Energy consumption in mixed task set using a Priority Exchange Server

An important factor that affects the performance of battery operated real-time and embedded systems is Energy. Various techniques have been employed to limit the energy dissipation. Dynamic voltage and frequency scaling (DVFS) is one of the most popular techniques for energy conservation in such systems and is a well researched area. This paper presents an energy conscious real-time scheduling algorithm - DVFSPES, DVFS with Priority Exchange Server for mixed task set comprising of periodic and aperiodic tasks. It uses Earliest Deadline First (EDF) based Priority Exchange Server. The results of DVFSPES are compared with EEDVFS, Energy Efficient DVFS algorithm, that uses an EDF based Deferrable Server on various performance metrics. Depending on the task set used DVFSPES can provide upto 50% improvement in response time of aperiodic tasks without compromising on the deadlines of the periodic task.