Memory system energy (poster session): influence of hardware-software optimizations

  • Authors:
  • G. Esakkimuthu;N. Vijaykrishnan;M. Kandemir;M. J. Irwin

  • Affiliations:
  • Department of Computer Science and Engineering, Pennsylvania State University, University Park, PA;Department of Computer Science and Engineering, Pennsylvania State University, University Park, PA;Department of Computer Science and Engineering, Pennsylvania State University, University Park, PA;Department of Computer Science and Engineering, Pennsylvania State University, University Park, PA

  • Venue:
  • ISLPED '00 Proceedings of the 2000 international symposium on Low power electronics and design
  • Year:
  • 2000

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Abstract

Memory system usually consumes a significant amount of energy in many battery-operated devices. In this paper, we provide a quantitative comparison and evaluation of the interaction of two hardware cache optimization mechanisms (block buffering and sub-banking) and three widely used compiler optimization techniques (linear loop transformation, loop tiling, and loop unrolling). Our results show that the pure hardware optimizations (eight block buffers and four sub-banks in a 4K, 2-way cache) provided up to 4% energy saving, with an average saving of 2% across all benchmarks. In contrast, the pure software optimization approach that uses all three compiler optimizations, provided at least 23% energy saving, with an average of 62%. However, a closer observation reveals that hardware optimization becomes more critical for on-chip cache energy reduction when executing optimized codes.