Energy Consumption of Apple Macintosh Computers
Energy Consumption of Apple Macintosh Computers
The search for better batteries
IEEE Spectrum
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ISLPED '00 Proceedings of the 2000 international symposium on Low power electronics and design
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Proceedings of the 2001 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
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SOSP '01 Proceedings of the eighteenth ACM symposium on Operating systems principles
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IEEE Transactions on Very Large Scale Integration (VLSI) Systems
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ICS '02 Proceedings of the 16th international conference on Supercomputing
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IEEE Micro
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IEEE Transactions on Computers
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ATEC '04 Proceedings of the annual conference on USENIX Annual Technical Conference
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PACS'02 Proceedings of the 2nd international conference on Power-aware computer systems
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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.