USENIX 2003 Annual Technical Conference, General Track Abstract
|Pp. 43-56 of the Proceedings
Currentcy: A Unifying Abstraction for Expressing Energy Management Policies
Heng Zeng, Carla S. Ellis, Alvin R. Lebeck, and Amin Vahdat, Duke University
The global nature of energy creates challenges and
opportunities for developing operating system policies to effectively
manage energy consumption in battery-powered mobile/wireless devices.
The proposed currentcy model creates the framework for the
operating system to manage energy as a first-class resource.
Furthermore, currentcy provides a powerful mechanism to formulate
energy goals and to unify resource management policies across diverse
competing applications and spanning device components with very
different power characteristics.
This paper explores the ability of the currentcy model to capture more
complex interactions and to express more mature energy goals than
previously considered. We carry out this exploration in ECOSystem, an
``energy-centric'' Linux-based operating system. We extend ECOSystem
to address four new goals: 1) reducing residual battery capacity at
the end of the targeted battery lifetime when it is no longer
required (e.g., recharging is available), 2) dynamic tracking of the
energy needs of competing applications for more effective energy
sharing, 3) reducing response time variation caused by limited energy
availability, and 4) energy efficient disk management. Our results
show that the currentcy model can express complex energy-related goals
and behaviors, leading to more effective, unified management policies
than those that develop from per-device approaches.
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