Define cache coherence and hypercube connection. For a node hypercube, – InterviewSolution

1.	Define cache coherence and hypercube connection. For a node hypercube, what will be its diameter?
Answer» Cache coherence simply MEANS that different processors might keep their own local caches. As a result, there could be several copies of the same data. Access to the local copies BEHAVES similarly to access from the local copies, with the exception of access time. A hypercube is a single node. An n node hypercube is made up of two n/2 node hypercubes connected by their RESPECTIVE nodes. An n node hypercube has a DIAMETER of log(n). The diameter is nothing but the smallest number of links needed to connect the two farthest nodes.

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