What is the difference between cache coherence and memory consistency?

What is the difference between cache coherence and memory consistency?

Cache coherence ensures that multiple caches in a system reflect the same data, while memory consistency defines the order of operations.

Can you give an example of cache coherence in action?

Sure! In a multi-core processor, if one core updates a value in its cache, cache coherence protocols ensure other cores see this update.

How does memory consistency affect program behavior?

Memory consistency affects how operations appear to execute in a program, influencing the visibility of writes across different threads.

What are some common memory consistency models?

Common models include sequential consistency, total store order, and release consistency, each defining different visibility rules.

Why is this distinction important in computer architecture?

Understanding these concepts is crucial for designing efficient systems and ensuring correct program execution in multi-threaded environments.