What is cache coherency in multi-core systems?
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What is cache coherency in multi-core systems?
Cache coherency refers to the consistency of data stored in local caches of a multi-core processor. It ensures that any changes made to a shared resource are reflected across all caches.
Why is cache coherency important?
It's crucial for maintaining data integrity and performance in multi-core systems, as it prevents stale data from being used by different cores.
What are the common protocols used for cache coherency?
Common protocols include MESI (Modified, Exclusive, Shared, Invalid), MOESI, and MSI, each with different strategies for managing cache states.
Can you explain the MESI protocol?
Sure! The MESI protocol uses four states for cache lines: Modified, Exclusive, Shared, and Invalid, to manage data consistency efficiently.
What challenges do developers face with cache coherency?
Developers often face challenges like increased latency, complexity in protocol implementation, and performance bottlenecks due to coherence traffic.
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