Nonideal battery and main memory effects on CPU speed-setting for low power

  • Authors:
  • Thomas L. Martin;Daniel P. Siewiorek

  • Affiliations:
  • Carnegie Mellon Univ., Pittsburgh, PA;Carnegie Mellon Univ., Pittsburgh, PA

  • Venue:
  • IEEE Transactions on Very Large Scale Integration (VLSI) Systems - Special issue on low power electronics and design
  • Year:
  • 2001

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Abstract

This paper explores the system-level power-performance tradeoffs of dynamically varying CPU speed. Previous work in CPU speed-setting considered only the power of the CPU and only CPUs that vary supply voltage with frequency. This work takes a broader approach, considering total system power, battery capacity, and main memory bandwidth. The results, which are up to a factor of four less than ideal, show that all three must be considered when setting the CPU speed.