Question: 10. If the operating system could predict the future, it could select the replacement page such that the next page fault is delayed as long

10. If the operating system could predict the future, it could select the replacement page such that the next page fault is delayed as long as possible. Such an algorithm is called OPT, the optimum page-replacement algorithm. It is a useful theoretical algorithm because it represents the best you could possibly do. When designers measure the performance of their page-replacement algorithms, they try to get as close as possible to the performance of OPT.

How many page faults does OPT produce for the sequence of Figures 9.13 and 9.16? How does that compare with FIFO and LRU?

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