Cache Coherence

Cache coherence refers to the consistency of data stored in the cache memory of multiple processors. In multi-core systems, each processor has its own cache to speed up access to frequently used data. However, when one processor updates data, that change must be reflected in the caches of other processors to ensure they all see the same information. Without cache coherence, different processors might operate on outdated or conflicting data, leading to errors. Various protocols and techniques are used to maintain this coherence, ensuring reliable and efficient operation in modern computing systems.