Energy-Aware Fault-Tolerant Scheduling Under Reliability and Time Constraints in Heterogeneous Systems

As heterogeneous systems have been deployed widely in various fields, the reliability become the major concern. Thereby, fault tolerance receives a great deal of attention in both industry and academia, especially for safety critical systems. Such systems require that tasks need to be carried out correctly in a given deadline even when an error occurs. Therefore, it is imperative to support fault-tolerance capability for systems. Scheduling is an efficient approach to achieving fault tolerance by allocating multiple copies of tasks on processors. Existing fault-tolerant scheduling algorithms realize fault tolerance without energy limit. To address this issue, this paper proposes an energy-aware fault-tolerant scheduling algorithm DRB-FTSA-E. The algorithm adopts the active replication strategy and uses a high utilization of energy consumption to complete a set of tasks with given reliability and time constraints. It finds out all schemes that meet time and system reliability constraints, and chooses the scheme with the maximum utilization of energy consumption as the final scheduling scheme. Experimental simulation results show that the proposed algorithm can effectively achieve the maximum utilization of energy consumption while meeting the reliability and time constraints.