A New Competitive Analysis of Randomized Caching

  • Authors:
  • Ching Law;Charles E. Leiserson

  • Affiliations:
  • -;-

  • Venue:
  • ISAAC '00 Proceedings of the 11th International Conference on Algorithms and Computation
  • Year:
  • 2000

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Abstract

We provide new competitive upper bounds on the performance of the memoryless, randomized caching algorithm RAND. Our bounds are expressed in terms of the inherent hit rate α of the sequence of memory references, which is the highest possible hit rate that any algorithm can achieve on the sequence for a cache of a given size. Our results show that RAND is (1 - αe-1/α)/(1 - α)-competitive on any reference sequence with inherent hit rate α. Since our new competitive bound does not scale up with the size k of the cache, it beats the putative Ω(lg k) lower bound on the competitiveness of randomized caching algorithms.