How do MESI and MOESI cache coherence protocols differ?
An example of an AI chatbot conversation about comparing MESI and MOESI cache coherence protocols.
What are the main differences between MESI and MOESI cache coherence protocols?
The MESI protocol has four states: Modified, Exclusive, Shared, and Invalid. MOESI adds an 'Owned' state, allowing a cache to hold a copy of a line that is shared with other caches but is responsible for updating it.
Why is the Owned state in MOESI beneficial?
The Owned state reduces the need for frequent memory accesses, as it allows a cache to serve requests for a line without going to main memory, improving performance.
In what scenarios would you prefer using MOESI over MESI?
MOESI is preferred in systems with high cache hit rates and multiple processors, as it can reduce memory traffic and improve overall efficiency.
Can you give an example of a system that uses MOESI?
Many modern multi-core processors, like those from Intel and AMD, implement the MOESI protocol to enhance performance in multi-threaded applications.
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