Before revision: Full bit vector format Diagram of full bit vector directory format In the full bit vector format, for each possible cache line in memory, a bit is used to track whether every individual processor has that line stored in its cache.
After revision: , where S=Shared, M=Modified, and U=UndefinedFull bit vector format Diagram of full bit vector directory format In the full bit vector format, for each possible cache line in memory, a bit is used to track whether every individual processor has that line stored in its cache.