This article presents a general framework to analyze and design embedded systems minimizing the energy consumption without violating timing requirements. A set of realistic assumptions is considered in the model in order to apply the results in practical real-time applications. The processor is assumed to have as a set of discrete operating modes, each characterized by speed and power consumption. The energy overhead and the transition delay incurred during mode switches are considered. Task computation times are modeled with a part that scales with the speed and a part having a fixed duration, to take I/O operations into account. The proposed method allows to compute the optimal sequence of voltage/speed changes that approximates the minimum continuous speed, which guarantees the feasibility of a given set of real-time tasks, without violating the deadline constraints. The analysis is performed both under fixed and dynamic priority assignments.

Minimizing CPU energy in real-time systems with discrete speed management

BINI, Enrico;BUTTAZZO, Giorgio Carlo;LIPARI, Giuseppe
2009-01-01

Abstract

This article presents a general framework to analyze and design embedded systems minimizing the energy consumption without violating timing requirements. A set of realistic assumptions is considered in the model in order to apply the results in practical real-time applications. The processor is assumed to have as a set of discrete operating modes, each characterized by speed and power consumption. The energy overhead and the transition delay incurred during mode switches are considered. Task computation times are modeled with a part that scales with the speed and a part having a fixed duration, to take I/O operations into account. The proposed method allows to compute the optimal sequence of voltage/speed changes that approximates the minimum continuous speed, which guarantees the feasibility of a given set of real-time tasks, without violating the deadline constraints. The analysis is performed both under fixed and dynamic priority assignments.
2009
File in questo prodotto:
File Dimensione Formato  
officialPaper.pdf

non disponibili

Tipologia: Documento in Post-print/Accepted manuscript
Licenza: Non pubblico
Dimensione 600.36 kB
Formato Adobe PDF
600.36 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11382/374704
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 56
social impact