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Critical sizing of LRU caches with dependent requests

Part of: Markov processes Stochastic processes Limit theorems Theory of data

Published online by Cambridge University Press:  14 July 2016

Predrag R. Jelenković ,
Ana Radovanović  and
Mark S. Squillante
Predrag R. Jelenković*
Affiliation:
Columbia University
Ana Radovanović*
Affiliation:
IBM T. J. Watson Research Center
Mark S. Squillante*
Affiliation:
IBM T. J. Watson Research Center
*
∗Postal address: Department of Electrical Engineering, Columbia University, New York, NY 10027, USA. Email address: predrag@ee.columbia.edu
∗∗Postal address: Department of Mathematical Sciences, IBM T. J. Watson Research Center, PO Box 218, Yorktown Heights, NY 10598, USA.
∗∗Postal address: Department of Mathematical Sciences, IBM T. J. Watson Research Center, PO Box 218, Yorktown Heights, NY 10598, USA.
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Abstract

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It was recently proved by Jelenković and Radovanović (2004) that the least-recently-used (LRU) caching policy, in the presence of semi-Markov-modulated requests that have a generalized Zipf's law popularity distribution, is asymptotically insensitive to the correlation in the request process. However, since the previous result is asymptotic, it remains unclear how small the cache size can become while still retaining the preceding insensitivity property. In this paper, assuming that requests are generated by a nearly completely decomposable Markov-modulated process, we characterize the critical cache size below which the dependency of requests dominates the cache performance. This critical cache size is small relative to the dynamics of the modulating process, and in fact is sublinear with respect to the sojourn times of the modulated chain that determines the dependence structure.

Keywords

Network cachingleast-recently-used cachingmove-to-front searchingnearly completely decomposable Markov processMarkov-modulated processZipf's law

MSC classification

Primary: 60J25: Continuous-time Markov processes on general state spaces 60F10: Large deviations
Secondary: 68P10: Searching and sorting 60G50: Sums of independent random variables; random walks
Type
Research Papers
Information
Journal of Applied Probability , Volume 43 , Issue 4 , December 2006 , pp. 1013 - 1027
Copyright
© Applied Probability Trust 2006 

Footnotes

Supported by the NSF, grant no. 0092113.

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