How does cache coherency affect system performance?

What is cache coherency and why is it important for system performance?

Cache coherency refers to the consistency of data stored in local caches of a shared resource. It's crucial because it ensures that all processors in a multi-core system have a consistent view of memory, which directly impacts performance.

How does cache coherency impact the speed of data access?

When cache coherency is maintained, it reduces the time processors spend waiting for data to be updated, leading to faster data access and improved overall system performance.

What are some common protocols used to maintain cache coherency?

Common protocols include MESI (Modified, Exclusive, Shared, Invalid), MOESI, and MSI. These protocols help manage how caches communicate and update data.

Can poor cache coherency lead to performance bottlenecks?

Yes, poor cache coherency can cause performance bottlenecks, as processors may frequently access main memory instead of their caches, leading to increased latency.