Multiversion scheduling in rechargeable energy-aware real-time systems

• Published in: 15th Euromicro Conference on Real-Time Systems, 2003. Proceedings pp. 95 - 104
• Main Authors: Rusu, C., Melhem, R., Mosse, D.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 2003
• Subjects: Battery management systems; Computer science; Energy consumption; Energy management; Frequency; Performance loss; Power system management; Processor scheduling; Real time systems; Voltage
• DOI: 10.1109/EMRTS.2003.1212732
• ISBN: 0769519369; 9780769519364

In the context of battery-powered real-time systems three constraints need to be addressed: energy; deadlines; and task rewards. Many future real-time systems will count on different software versions, each with different rewards, time and energy requirements, to achieve a variety of QoS-aware tradeoffs. We propose a solution that allows the device to run the most valuable task versions while still meeting all deadlines and without depleting the energy. Assuming that the battery is rechargeable, we also propose: (a) a static solution that maximizes the system value assuming a worst-case scenario (i.e., worst-case task execution times); and (b) a dynamic scheme that takes advantage of the extra energy in the system when worst-case scenarios do not happen. Three dynamic policies are shown to make better use of the recharging energy while improving the system value.