What is cache coherency in multithreading?
Cache coherency refers to the consistency of data stored in local caches of a shared resource in a multithreaded environment.
Why is it important for performance?
It's crucial because it ensures that all threads see the same data, preventing errors and improving efficiency.
What are some common protocols used for maintaining cache coherency?
Common protocols include MESI (Modified, Exclusive, Shared, Invalid) and MOESI, which help manage data states across caches.
Can you explain how MESI works?
Sure! MESI uses four states to track cache lines: Modified, Exclusive, Shared, and Invalid, ensuring proper data sharing.
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