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Authors:
Michael T. Goodrich, Roberto Tamassia, Michael H. Goldwasser
Chapter:
Memory Management And B-trees
Exercise:
Exercises
Question:20 | ISBN:9781118771334 | Edition: 6

Question

rule, where the page in the cache that has been accessed the least often is the one that is evicted when a new page is requested. If there are ties, LFU evicts the least frequently used page that has been in the cache the longest. Show that there is a sequence P of n requests that causes LFU to miss W(n) times for a cache of m pages, whereas the optimal algorithm will miss only O(m) times.

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