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An analytical model for designing memory hierarchies

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4 Author(s)
Jacob, B.L. ; Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA ; Chen, P.M. ; Silverman, S.R. ; Mudge, T.N.

Memory hierarchies have long been studied by many means: system building, trace driven simulation, and mathematical analysis. Yet little help is available for the system designer wishing to quickly size the different levels in a memory hierarchy to a first order approximation. We present a simple analysis for providing this practical help and some unexpected results and intuition that come out of the analysis. By applying a specific, parameterized model of workload locality, we are able to derive a closed form solution for the optimal size of each hierarchy level. We verify the accuracy of this solution against exhaustive simulation with two case studies: a three level I/O storage hierarchy and a three level processor cache hierarchy. In all but one case, the configuration recommended by the model performs within 5% of optimal. One result of our analysis is that the first place to spend money is the cheapest (rather than the fastest) cache level, particularly with small system budgets. Another is that money spent on an n level hierarchy is spent in a fixed proportion until another level is added

Published in:

Computers, IEEE Transactions on  (Volume:45 ,  Issue: 10 )

Date of Publication:

Oct 1996

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