Power optimization for interactive systems

Most previous system power optimization work has been CPU-centric and devoted to reducing the system busy energy, which can be seen to be minuscule for the applications shown in Table 1. Since the user interface, and hence the display, must be active while the system waits for user input, reducing user interface and display-related energy can be quite effective for interactive systems [8,5,28]. Since interactive systems spend so much time and energy waiting, it is extremely important to accelerate software usage through user interface designs to achieve energy efficiency [28].