Ordonnancement temps réel multiprocesseur pour la réduction de la consommation énergétique des systèmes embarqués. (Energy-aware real-time scheduling of multiprocessor embedded systems)

Reduire la consommation energetique des systemes temps reel embarques multiprocesseurs est devenu un enjeu important notammentpour augmenter leur autonomie. Nous reduisons la consommation statique des processeurs en exploitant leurs etats basseconsommation. Dans un etat basse-consommation, la consommation energetique est fortement reduite mais un delai de transition et une penalite sont necessaires pour revenir a l'etat actif. Nous proposons dans cette these les premiers algorithmes d'ordonnancement tempsreel multiprocesseurs optimaux pour reduire la consommation energetique des systemes temps reel dur et des systemes temps reel acriticite mixte. Ces algorithmes d'ordonnancement permettent d'activer les etat basse-consommation les plus economes en energie.Chaque algorithme d'ordonnancement est divise en deux parties. La premiere partie hors-ligne genere un ordonnancement en utilisant laprogrammation lineaire en nombres entiers pour minimiser la consommation energetique. La seconde partie est en-ligne et augmente lataille des periodes d'inactivite les tâches terminent leur execution plus tot que prevu. Dans le cadre des systemes temps reel a criticitemixte, nous profitons du fait que les tâches de plus faible criticite peuvent tolerer des depassements d'echeances pour etre plus agressifhors-ligne afin de reduire davantage la consommation energetique. Les resultats montrent que les algorithmes proposes utilisent demaniere plus efficace les etats basse-consommation. La consommation energetique lorsque ceux-ci sont actives est en effet jusqu'a dix fois plus faible qu'avec les algorithmes d'ordonnancement multiprocesseurs existants.

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