|
The Firefly cache coherence protocol is the schema used in the DEC Firefly multiprocessor workstation, developed by DEC Systems Research Center. This protocol uses a write-through policy. == States == In this protocol, the following states can be assigned to each block: * Valid-Exclusive: This block has a coherent copy of the memory. There is only one copy of the data in caches. * Shared: This block has a coherent copy of the memory. The data may be possibly shared, but its content is not modified. * Dirty: The block is the only copy of the memory and it is incoherent. This is the only state that generates a write-back when the block is replaced in the cache. These states correspond to the ''Exclusive'', ''Shared'', and ''Modified'' states of the MESI protocol. This protocol never causes invalidation, so the ''Invalid'' state is not listed here. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Firefly (cache coherence protocol)」の詳細全文を読む スポンサード リンク
|