Abstract

Energy consumption is a major systems-design challenge. ECOSystem incorporates the “currentcy model, ” which lets the operating system manage energy as a first-class resource. It can also express complex energy-related goals and behaviors, leading to more effective, unified management policies. Mobile devices are becoming increasingly popular, from laptops, PDAs, and cell phones to emerging platforms such as wireless sensor networks. Available battery energy has become a critical mobilesystem resource. A mobile device’s usefulness is often limited not by its hardware’s raw speed but by its battery’s energy. Ideally, designers should address the energy problem at all system levels: hardware, operating system, and application. At the hardware level, low-power circuit design can reduce energy consumption. In addition, hardware devices can provide device-specific power management features that you can exploit with power-management policies at the system’s higher levels. At the OS level, we can observe the applications’ and devices ’ combined resource demands. Existing OSlevel energy management tends to focus on individual devices. For example, scheduling for processors with dynamic voltage scaling (DVS) allocates CPU time to tasks and manipulates the CPU power states. 1–4 Similarly, disk and network policies concentrate only on the request patterns to their specific devices and on managing their available

Citations