least recently used

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least recently used [′lēst ¦rē·sənt·lē ‚yüzed]

(computer science)

A technique for using main storage efficiently, in which new data replace data in storage locations that have not been accessed for the longest period, as determined by an algorithm.

least recently used - (operating systems) (LRU) A rule used in a paging system which selects a page to be paged out if it has been used (read or written) less recently than any other page. The same rule may also be used in a cache to select which cache entry to flush.

This rule is based on temporal locality - the observation that, in general, the page (or cache entry) which has not been accessed for longest is least likely to be accessed in the near future.

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