Advanced Cache Concepts: Snoopy and Directory Cache coherence protocol

• Since all the processors share the same address space, it is possible for more than one processor to cache an address at the same time.(coherence issue).
• If one processor updates the data item without informing the other processor, inconsistency may result and cause incorrect execution.(consistency issue).

• To solve this problem we suggest below two cache coherence protocols

                  1. Snoopy protocol

                 2. Directory protocol

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