Issue No. 06 - November/December (1998 vol. 18)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/40.743684
The utility of a portable computer is critically dependent on the period it can be used while running off the battery. In this article, we present a study of power consumption in Apple Macintosh computers. We measure the existing power consumption for each system component using built-in measuring tools. Since total power consumption is a function of user workload, we use eight user workload traces to determine power use as observed in practice. Apple currently implements some simple power-saving features, and the effectiveness of those features is estimated; we find typical power savings of 41-66%. After the use of basic power-saving techniques, we find that the major power users are the backlight (25-26%), the CPU (9-25%), the display (4-17%), the video circuitry (6-10%), and the hard drive (4-9%). We then evaluate possible changes in system hardware and software with regard to the power savings they might offer.
Portables, power-savers, Macintosh computers
A. J. Smith and J. R. Lorch, "Apple Macintosh's Energy Consumption," in IEEE Micro, vol. 18, no. , pp. 54-63, 1998.