Processing information (analysis, storing, retrieving, sharing) is the primary function of modern computer-based information systems. Systems of this type generally require an input flow of exergy (available energy) to function. Information processing systems now are evolving in two directions. One direction is towards bigger and more sophisticated systems. The other is towards systems that are more compact and portable. In both cases, the energy efficiency is becoming an increasingly important design issue. This paper summarizes an exploration of the exergy cost of processing information at the component and system levels in state-of-the-art information processing systems. The energy efficiency characteristics of computer-based information technologies are also compared to estimates of the energy efficiency of biological information processing in brains of mammals. Energy efficiencies of processors and systems are quantified in terms of the ratio of MIPS to exergy input rate. Available data suggest that for recent generations of processors, this ratio has been increasing proportional to the square root of processor speed. Despite this increase, the energy efficiency of computer-based systems is currently substantially below the estimated efficiency of biological systems. The data also suggest that unless processor energy efficiencies are greatly increased, the development of information processing systems that match human brain performance will be hindered by the need for large power supplies and high-capacity heat rejection systems.
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ASME 2004 International Mechanical Engineering Congress and Exposition
November 13–19, 2004
Anaheim, California, USA
Conference Sponsors:
- Advanced Energy Systems Division
ISBN:
0-7918-4701-2
PROCEEDINGS PAPER
The Exergy Cost of Information Processing: A Comparison of Computer-Based Technologies and Biological Systems
V. P. Carey,
V. P. Carey
University of California at Berkeley
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A. J. Shah
A. J. Shah
University of California at Berkeley
Search for other works by this author on:
V. P. Carey
University of California at Berkeley
A. J. Shah
University of California at Berkeley
Paper No:
IMECE2004-61376, pp. 57-65; 9 pages
Published Online:
March 24, 2008
Citation
Carey, VP, & Shah, AJ. "The Exergy Cost of Information Processing: A Comparison of Computer-Based Technologies and Biological Systems." Proceedings of the ASME 2004 International Mechanical Engineering Congress and Exposition. Advanced Energy Systems. Anaheim, California, USA. November 13–19, 2004. pp. 57-65. ASME. https://doi.org/10.1115/IMECE2004-61376
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