Rate monotonic scheduling in hard real-time systems
Information Processing Letters
The Deferrable Server Algorithm for Enhanced Aperiodic Responsiveness in Hard Real-Time Environments
IEEE Transactions on Computers
Minimum Achievable Utilization for Fault-Tolerant Processing of Periodic Tasks
IEEE Transactions on Computers
Fault-Tolerant Rate-Monotonic Scheduling
Real-Time Systems
Scheduling Algorithms for Multiprogramming in a Hard-Real-Time Environment
Journal of the ACM (JACM)
Anomaly Detection in Embedded Systems
IEEE Transactions on Computers - Special issue on fault-tolerant embedded systems
Journal of Systems and Software
Power saving and fault-tolerance in real-time critical embedded systems
Journal of Systems Architecture: the EUROMICRO Journal
Fault tolerance evaluation and schedulability analysis
Proceedings of the 2011 ACM Symposium on Applied Computing
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This paper presents a method to deal with the reexecution of tasks in a hard real-time system subject to temporary faults. The set of tasks follows the Liu and Layland model: they are periodic, independent and preemptible. Time is considered to be slotted. The system is said to be k-schedulable if it is schedulable in spite of the fact that in the interval between its release and its deadline, every task admits that k slots are devoted to uses other than its first execution. In this case, the k slots are used to reexecute tasks subject to temporary faults. Since the value of k can be easily determined, a least upper bound on all the possible combinations of faults that the system can tolerate while meeting the hard time-constraints, follows immediately. The method is bandwidth preserving and the expression of the bound is a diophantic inequality relating k, the execution time and the period of each task. The method is compared to methods proposed by other authors to solve the same problem and it is evaluated through extensive simulations performed on random generated sets of tasks.