Real-Time Syst https://doi.org/10.1007/s11241-018-9311-1 Stretching algorithm for global scheduling of real-time DAG tasks 1 2,3 Manar Qamhieh · Laurent George · Serge Midonnet © Springer Science+Business Media, LLC, part of Springer Nature 2018 Abstract Parallelism is becoming more important nowadays due to the increasing use of multiprocessor systems. A Directed Acyclic Graph (DAG) is a general model of parallel tasks with inter-subtask parallelism. It consists of a collection of depen- dent subtasks under precedence constraints. In this paper, we study the problem of scheduling n periodic parallel real-time DAG tasks on m homogeneous multipro- cessor systems. The dependencies between subtasks make scheduling process more challenging. We propose a stretching algorithm to be applied on each DAG task prior to scheduling process. Thus, DAGs are transformed into a set of independent sequential threads with intermediate offsets and deadlines. The threads obtained due to the trans- formation are of two types, (i) fully-stretched master threads with utilization equal to 1 and (ii) independent constrained-deadline threads. We propose a scheduling method over RTOS to ensure the execution of fully-stretched master threads on dedicated pro- cessors while the remaining processors m ≤ m, are used to schedule the independent constrained-deadline threads using any multiprocessor
Real-Time Systems – Springer Journals
Published: Jun 5, 2018
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