Introduction - If you have any usage issues, please Google them yourself
Replacement Policy: also known as the phase-out strategy, involving the memory space available when required under can not be installed transferred the information, decided to transfer out of an area has been occupied by the memory of that piece of information in order to make room. The basic idea of the algorithm OPT are: page fault occurs, some pages in memory, of which one will soon be visited (including followed by an instruction that the next page), while other pages have to move to 10,100 , or 1000 instructions only after visit, every page can be used for the first time to visit the page number of instructions to be executed before tagging