Cache coherency protocol for multi processor computer system
    1.
    发明授权
    Cache coherency protocol for multi processor computer system 失效
    多处理器计算机系统的缓存一致性协议

    公开(公告)号:US5297269A

    公开(公告)日:1994-03-22

    申请号:US66597

    申请日:1993-05-24

    IPC分类号: G06F12/08 G06F12/00

    CPC分类号: G06F12/0828

    摘要: A cache coherency protocol for a multi-processor system which provides for read/write, read-only and transitional data states and for an indication of these states to be stored in a memory directory in main memory. The transitional data state occurs when a processor requests from main memory a data block in another processor's cache and the request is pending completion. All subsequent read requests for the data block during the pendency of the first request are inhibited until completion of the first request. Also provided in the memory directory for each data block is a field for identifying the processor which owns the data block in question. Data block ownership information is used to determine where requested owned data is located.

    摘要翻译: 用于多处理器系统的缓存一致性协议,其提供读/写,只读和过渡数据状态,以及用于将这些状态的指示存储在主存储器中的存储器目录中。 当处理器从主存储器请求另一个处理器的缓存中的数据块并且请求正在等待完成时,发生过渡数据状态。 在第一个请求的未决期间,数据块的所有后续读取请求被禁止,直到完成第一个请求。 在每个数据块的存储器目录中还提供了用于识别拥有所讨论的数据块的处理器的字段。 数据块所有权信息用于确定所请求的数据所在的位置。