Pseudo lru cache algorithms adaptive (1 résultats)

Taschenbuch. Etat : Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Please note that the content of this book primarily consists of articlesavailable from Wikipedia or other free sources online. Pseudo-LRU (alsoknown as Tree-LRU, LRU meaning least recently used) is an efficientalgorithm to find an item that most likely has not been accessed veryrecently, given a set of items and a sequence of access events to theitems. This technique is used in the CPU cache of the Intel 486 and inmany processors in the Power Architecture (formerly PowerPC) familysuch as Freescale's PowerPC G4 used by Apple Computer. The algorithmworks as follows: consider a binary search tree for the items inquestion. Each node of the tree has a one-bit flag denoting 'go left tofind a pseudo-LRU element' or 'go right to find a pseudo-LRU element'.To find a pseudo-LRU element, traverse the tree according to the valuesof the flags. To update the tree with an access to an item N, traversethe tree to find N and, during the traversal, set the node flags todenote the direction that is opposite to the direction taken.…