Methods and apparatus for providing cache state information

G - Physics – 06 – F

Patent

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G06F 12/08 (2006.01)

Patent

CA 2525951

According to the present invention, methods and apparatus are provided for increasing the efficiency of data access in a multiple processor, multiple cluster system. Mechanisms for allowing a variety of transactions to complete locally are implemented by providing remote data caches associated with the various clusters in the system. The remote data caches receive data and state information for memory lines held in remote clusters. State information is provided to the remote data cache using various mechanisms including a coherence directory and augmented source done messages.

Selon la présente invention, sont présentés des procédés et un appareil destinés à commenter l'efficacité d'accès aux données dans un système multi-processeurs, multi-grappes. Des mécanismes permettant d'exécuter localement une variété de transactions sont mis en oeuvre par fourniture de mémoires cache de données distantes associées aux diverses grappes dans le système. Les mémoires cache de données distantes reçoivent des données ainsi que des informations d'état pour des lignes de mémoire contenues dans des grappes distantes. Des informations d'état sont fournies à la mémoire cache de données distante au moyen de divers mécanismes, notamment un répertoire de cohérence et des messages traités par des sources renforcées.

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