Cahce Coherence (Cache Cohrency Problem)

What is Cache Coherence Problem?

In a single CPU system, two copies of same data, one in cache memory and another in main memory may become different. This data inconsistency is called as cache coherence problem.

Figure : Cache Coherence Problem

Different strategies to writing into cache:

 

Figure : Different Strategies to writing Cache Memory

Different approaches to prevent data inconsistency, that is to protect cache coherency:

Figure : Approaches to prevent data incosistency in Cache Memory

To learn more about Cache Coherence Probelm and its prevention techniques, watch below video

Video : Cache Coherence and its prevention techniques

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