Least frequently used
Algorithm for caching data / From Wikipedia, the free encyclopedia
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Least Frequently Used (LFU) is a type of cache algorithm used to manage memory within a computer. The standard characteristics of this method involve the system keeping track of the number of times a block is referenced in memory. When the cache is full and requires more room the system will purge the item with the lowest reference frequency.
LFU is sometimes combined with a Least Recently Used algorithm and called LRFU.[1]