What is the impact of cache coherency in multi-core processors?

What is the impact of cache coherency in multi-core processors?

Cache coherency ensures that multiple processors in a multi-core system have a consistent view of shared data, preventing stale data issues.

Why is cache coherency important for performance?

It's crucial because it reduces the overhead of data synchronization, allowing processors to work more efficiently and improving overall system performance.

What are the common protocols used for cache coherency?

Common protocols include MESI (Modified, Exclusive, Shared, Invalid), MOESI, and MSI, each managing cache states differently.

How does cache coherency affect system design?

It influences the architecture of multi-core systems, requiring careful design to balance performance, complexity, and power consumption.

Can you give an example of a cache coherency issue?

Sure! A classic example is the 'cache thrashing' problem, where frequent updates to shared data lead to excessive invalidation and reloading of cache lines.