A Stretching Algorithm for Parallel Real-time DAG Tasks on Multiprocessor Systems

Manar Qamhieh 1 Laurent George 2 Serge Midonnet 1
1 LIGM - Laboratoire d'Informatique Gaspard-Monge
2 LISSI - Laboratoire Images, Signaux et Systèmes Intelligents
Abstract : Parallelism is becoming more important nowadays due to the increasing use of multiprocessor systems. In this paper, we study the problem of scheduling periodic parallel real-time Directed Acyclic graph (DAG) tasks on m homogeneous multiprocessor systems. A DAG task is an example of inter-subtask parallelism. It consists of a collection of dependent subtasks under precedence constraints. The dependencies between subtasks make scheduling process more challenging. We propose a stretching algorithm applied on each DAG tasks to transform them into a set of independent sequential threads with intermediate offsets and deadlines. The threads obtained with the transformation are two types, (i) fully-stretched master threads with utilization equal to 1 and (ii) constrained-deadline independent threads. The fully-stretched master threads are assigned to dedicated processors and the remaining processors m' ≤ m, are scheduled using global EDF scheduling algorithm. Then, we prove that preemptive global EDF scheduling of stretched threads has a resource augmentation bound equal to (3+ √ 5)/2 for all tasksets with n < ϕ * m , where n is the number of tasks in the taskset and ϕ is the golden ratio 1 .
Keywords : Real-time scheduling parallel tasks Directed Acyclic Graphs global EDF scheduling speedup factor
Type de document :
Communication dans un congrès
The 22nd International Conference on Real-Time Networks and Systems, Oct 2014, Versaille, France. The 22Nd International Conference on Real-Time Networks and Systems, RTNS '14, pp.13-22, 2014, Proceedings of the 22nd International Conference on Real-Time Networks and Systems. 〈10.1145/2659787.2659818〉
Liste complète des métadonnées

Littérature citée [12 références]  Voir  Masquer  Télécharger
https://hal-upec-upem.archives-ouvertes.fr/hal-01090627
Contributeur : Manar Qamhieh <>
Soumis le : mercredi 3 décembre 2014 - 18:36:19
Dernière modification le : mercredi 4 juillet 2018 - 16:37:57
Document(s) archivé(s) le : lundi 9 mars 2015 - 05:52:46

Fichier

ManarQamhieh_RTNS2014.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

UPEC-UPEM | LIGM_LRT | ENPC | PARISTECH | LISSI | LIGM | ESIEE-PARIS

Citation

Manar Qamhieh, Laurent George, Serge Midonnet. A Stretching Algorithm for Parallel Real-time DAG Tasks on Multiprocessor Systems. The 22nd International Conference on Real-Time Networks and Systems, Oct 2014, Versaille, France. The 22Nd International Conference on Real-Time Networks and Systems, RTNS '14, pp.13-22, 2014, Proceedings of the 22nd International Conference on Real-Time Networks and Systems. 〈10.1145/2659787.2659818〉. 〈hal-01090627〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

408

Téléchargements de fichiers

657

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD