What are some examples of cache coherency in computing?
Cache coherency refers to the consistency of data stored in local caches of a shared resource. Examples include MESI protocol, MOESI protocol, and directory-based cache coherency.
Can you explain the MESI protocol?
Sure! The MESI protocol stands for Modified, Exclusive, Shared, and Invalid. It helps maintain cache coherency by defining states for cache lines.
How does the MOESI protocol differ from MESI?
The MOESI protocol adds an 'Owned' state, allowing a cache to have a copy of a line that is shared with other caches, improving efficiency.
What are the challenges in implementing cache coherency?
Challenges include increased complexity, latency in communication between caches, and the overhead of maintaining consistency across multiple processors.
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