What are the main challenges in cache coherency?
The main challenges in cache coherency include maintaining consistency across multiple caches, handling latency, and ensuring data integrity.
Can you explain why maintaining consistency is so difficult?
Maintaining consistency is difficult because multiple processors may read and write to shared data simultaneously, leading to stale or conflicting data.
What techniques are used to address these challenges?
Techniques like MESI protocol, directory-based coherence, and snooping are commonly used to manage cache coherency.
How does the MESI protocol work?
The MESI protocol uses four states (Modified, Exclusive, Shared, Invalid) to track the status of cache lines and ensure data consistency.
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