The concept of cache coherence may be relatively new to you, but it’s a relatively important computer field concept. So today, this page will give you a general introduction to cache coherence . Overview In computer architecture, cache coherence is the consistency of shared resource data, which is eventually stored in multiple local caches. Problems can occur with incoherent data when clients maintain caches of common memory resources, especially common for CPUs in multiprocessing systems. Each processor has a separate cache memory in a shared-memory multiprocessor system. It’s likely to have many copies of the shared data: one copy in the primary memory and one in the local cache of each processor requesting it. If one of the copies of the data changes, the other copies must reflect the change. Cache coherence is a discipline, and it ensures that changes in shared operands (data) values propagate throughout the system promptly. The following part lists the requirements for cache ...
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