Optimal Replacement Is NP-Hardfor Nonstandard Caches

  • Authors:
  • Mark Brehob;Stephen Wagner;Eric Torng;Richard Enbody

  • Affiliations:
  • -;-;-;-

  • Venue:
  • IEEE Transactions on Computers
  • Year:
  • 2004

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Abstract

Abstract--When examining a new cache structure or replacement policy, the optimal policy is a useful baseline. In this paper, we prove that finding the optimal schedule is NP-hard for any but the simplest of caches, and that no polynomial-time approximation scheme exists for this problem unless P=NP.