Cache coherency system and method for a multiprocessor...

G - Physics – 06 – F

Patent

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G06F 12/00 (2006.01) G06F 12/08 (2006.01)

Patent

CA 2409438

A cache coherency directory (303) for use in a shared memory multiprocessor computer system (100). A data structure (400) is associated with each cacheable memory location, the data structure comprising locations for storing state values indicating an exclusive state (501), a shared state (502), an uncached state (503), a busy state (506), a locked state (504), and appending state (524). The busy state and pending state cooperate to reserve a cache line for future use by a processor while the cache line is currently being used by one or more other processors.

L'invention concerne un répertoire de cohérence d'antémémoire (303), utile dans un système informatique multiprocesseur à mémoire partagée (100). Une structure de données (400) est associée à chaque emplacement de mémoire antémémorisable, et elle comprend des emplacements destinés à stocker des valeurs d'état indiquant un état exclusif (501), un état partagé (502), un état de non-antémémoire (503), un état occupé (506), un état bloqué (504) et un état d'attente (524). L'état occupé et l'état d'attente coopèrent pour réserver une ligne d'antémémoire, aux fins d'utilisation future par un processeur, pendant que cette ligne d'antémémoire est en cours d'utilisation par un ou plusieurs autres processeurs.

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