Reliability-aware fixed priority energy management with shared resources in real-time system

Abstract

In this paper, we focus on preemptive rate monotonic scheduling and comprehensively consider energy consumption and system reliability about scheduling periodic tasks with shared resources. Firstly, a static scheme for fixed priority periodic tasks with shared resources is proposed, which executes with a uniform speed and ignores the system reliability. Secondly, the problem of energy consumption and system reliability for scheduling fixed priority periodic tasks with shared resources is proved to be NP-hard and a maximum execution time first (MF) algorithm is proposed. Finally, a dynamic scheme for fixed priority periodic tasks with shared resources (DA) is proposed. The DA algorithm exploits the dynamic slack time to save energy while preserving the system reliability. The experimental results show that the DA algorithm saves about 19.28% energy compared with the MF algorithm.