How does cache coherency work in multi-core processors?

Can you explain how cache coherency works in multi-core processors?

Sure! Cache coherency ensures that multiple caches in a multi-core processor maintain a consistent view of shared data.

Why is cache coherency important for performance?

It's crucial because it prevents data inconsistency and reduces the need for frequent memory accesses, improving overall performance.

What are the common protocols used for cache coherency?

Common protocols include MESI (Modified, Exclusive, Shared, Invalid) and MOESI, which help manage the states of cached data.

How do these protocols handle data updates?

When a core updates data, the protocol ensures that other caches are notified, so they can invalidate or update their copies accordingly.