Conclusion

Energy management is an increasingly important aspect of system design. Our previously proposed currentcy model provides the framework for the operating system to manage energy as a first-class resource. This paper demonstrates that the currentcy model can be used to specify energy management policies that span multiple devices and diverse applications.

Using our ECOSystem prototype, we implement several currentcy-based policies, including: currentcy conserving scheduling algorithms that reduce residual battery capacity, proportional energy sharing, self-pacing to smooth response time variation, and energy efficient disk management. Our results show that the currentcy model is a powerful framework for expressing energy management policies and that our currentcy-based policies, by being able to capture aspects of global energy use, provide more coherency to system-wide energy management.