Cache data control method, node controller and system

Abstract

The embodiments of the present invention disclose a cache data control method. The cache data control method comprises the following steps: receiving a data access request sent by a source node by a node controller, wherein the data access request carries an access address and an access type; if the access type is a share request, querying whether a first directory entry of the access address exists in a first directory or not by the node controller, and determining that cache data corresponding to the access address are of an exclusive state if the first directory entry of the access address exists in the first directory; determining a target node where the cache data are located according to a storage location in the first directory entry; sending a first interception message to the target node by the node controller, wherein the first interception message is used for indicating the target node to return the cache data to the node controller; and returning the cache data to the source node by the node controller and deleting the first directory entry in the first directory. The embodiments of the present invention also disclose the node controller. By adopting the cache data control method and the node controller, the requirements of directories on storage space can be lowered.

Description

technical field [0001] The invention relates to the field of computers, in particular to a cache data control method, a node controller and a system. Background technique [0002] In the CC-NUMA system built with high-performance processors, due to the limited expansion capability of the processor itself, it is necessary to divide the processor into multiple nodes, and use the NC (Node Controller, NC for short) in the node to perform multiprocessing Server expansion to increase the number of processors for parallel processing and improve system performance. In a CC-NUMA system, a processor usually has a large-capacity extended memory and a large-capacity cache (for example, L3 cache). For example, in a common CC-NUMA system, the extended memory of a single processor reaches more than 1T, the capacity of the L3 cache reaches about 30MB, and the capacity of the extended memory of a node is usually several TB. In the NUMA system as an example, the total capacity of the L3 cac...

AI Technical Summary

Problems solved by technology

However, with the rapid increase of the extended memory in the node, the capacity of the directory also increases sharply. The existing method of compressing the directory cannot reduce the storage space requirements of the directory very well.

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