What is cache coherency in multi-core processors?
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What is cache coherency in multi-core processors?
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 data item in one cache are reflected in all other caches.
Why is cache coherency important?
It's crucial because it prevents data inconsistency and ensures that all cores have the most recent data, which is essential for correct program execution.
How do multi-core processors maintain cache coherency?
They use protocols like MESI (Modified, Exclusive, Shared, Invalid) to manage the states of cached data and ensure that all cores see a consistent view of memory.
What are the challenges in implementing cache coherency?
Challenges include increased complexity, potential performance bottlenecks, and the overhead of maintaining coherence across multiple caches.
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