What are coherence protocols in computer architecture?
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What are coherence protocols in computer architecture?
Coherence protocols ensure that multiple caches in a system maintain a consistent view of memory. They manage how data is shared and updated across different processors.
Why are coherence protocols important for multi-core processors?
They are crucial because they prevent data inconsistency and ensure that all cores have the most recent data, which is vital for performance and correctness.
Can you explain the difference between directory-based and snoopy coherence protocols?
Sure! Directory-based protocols use a central directory to track which caches have copies of data, while snoopy protocols allow caches to monitor the bus for transactions to maintain coherence.
What are some common coherence protocols used in modern systems?
Common protocols include MESI (Modified, Exclusive, Shared, Invalid), MOESI, and MSI, each with different states for cache lines.
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