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stephyeung

In this example, normally with snooping, if Processor 0 wants to read a line then it will have to 'shout' to all of the processors. In directory-based though, it will send a message to the home node of the address (where home node is defined by a hash on the address). And then here, since no other cache has the entry, it will just respond with the contents from memory and not have to bother any of the other processors.