Title :
The Global EDF Scheduling of Systems of Conditional Sporadic DAG Tasks
Author :
Baruah, Sanjoy ; Bonifaci, Vincenzo ; Marchetti-Spaccamela, Alberto
Author_Institution :
Univ. of North Carolina, Chapel Hill, NC, USA
Abstract :
The sporadic DAG task model exposes parallelism that may exist within individual tasks to the run-time scheduling mechanism, and is therefore considered a particularly suitable model for representing recurrent real-time tasks that are to be implemented upon multiprocessor platforms. This paper proposes and evaluates an extension to the model to allow for the concurrent modeling of conditional execution of pieces of an individual task, along with the modeling of intra-task parallelism. The Global Earliest Deadline First (GEDF) scheduling of systems represented in this generalized model is studied, and a GEDF-schedulability test is derived. With regards to GEDF scheduling it is shown that there is no penalty, in terms of worse speedup factor, in generalizing the sporadic DAG tasks model in this manner.
Keywords :
concurrency (computers); directed graphs; processor scheduling; GEDF scheduling; GEDF-schedulability test; concurrent modeling; conditional execution; conditional sporadic DAG task; global EDF scheduling; global earliest deadline first scheduling; intra-task parallelism; multiprocessor platform; recurrent real-time task; run-time scheduling mechanism; sporadic DAG task model; Computational modeling; Processor scheduling; Program processors; Real-time systems; Schedules; Scheduling;
Conference_Titel :
Real-Time Systems (ECRTS), 2015 27th Euromicro Conference on
Conference_Location :
Lund
DOI :
10.1109/ECRTS.2015.27