If they don’t, they will simply ignore the request. If they do, they will send it back to the requesting cache. The other caches on the bus will then check to see if they have a copy of the data. When one cache wants to read or write to a location on the bus, it will send out a request. This is done through a process called snooping. In order for the caches to stay consistent, they need to communicate with each other. When multiple processors are sharing a bus, they will each have their own cache. Can you explain how snooping works with a shared bus and multiple processors? If the data is modify, then the cache has a modified version of the data and will serve that. If the data is exclusive, then the cache has the most up-to-date version of the data and can serve it. If the data is shared, then the cache will fetch the data from one of the other caches. If the data is invalid, then the cache will fetch the data from memory. When a cache wants to read data, it first checks the states of the other caches to see if the data is valid. The protocol works by having each cache keep track of the state of the data it has. It stands for Modify, Exclusive, Shared, Invalid. The MESI protocol is a cache coherence protocol that is used to keep caches in sync. If the data in the cache is inaccurate, then the computer could end up making incorrect decisions. This is important because the cache is used to store data that the computer needs to access quickly. What is cache coherence in computer architecture?Ĭache coherence is the process of making sure that the data in a computer’s cache is up-to-date and accurate. Here are 20 commonly asked Cache Coherence interview questions and answers to prepare you for your interview: 1. Cache Coherence Interview Questions and Answers In this article, we will review some of the most common cache coherence interview questions and provide tips on how to answer them. A thorough understanding of cache coherence is essential for any computer engineer, and being able to answer questions about it confidently can make the difference between getting a job offer and being passed over. Cache coherence is a critical component of any modern computer system, yet it is often misunderstood by those who are not familiar with the inner workings of a CPU.
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