An integrated approach to reducing power dissipation in memory hierarchies

  • Authors:
  • Jayaprakash Pisharath;Alok Choudhary

  • Affiliations:
  • Northwestern University, Evanston IL;Northwestern University, Evanston IL

  • Venue:
  • CASES '02 Proceedings of the 2002 international conference on Compilers, architecture, and synthesis for embedded systems
  • Year:
  • 2002

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Abstract

In recent years, both performance and power have become key factors in efficient memory design. In this paper, we propose a systematic approach to reduce the energy consumption of the entire memory hierarchy. We first evaluate an existing power-aware memory system where memory modules can exist in different power modes, and then propose on-chip memory module buffers, called Energy-Saver Buffers (ESB), which reside in-between the L2 cache and main memory. ESBs reduce the additional overhead incurred due to frequent resynchronization of the memory modules in a low-power state. An additional improvement is attained by using a model that dynamically resizes the active cache based on the varying needs of a program. Our experimental results demonstrate that an integrated approach can reduce the energy-delay product by as much as 50% when compared to a traditional non power-aware memory hierarchy.