Studies on Indicator of the Page Replacement Algorithm in the OS

In the management of memory resources,modern OS introduces virtual memory technology.There are three main ways in the realization of virtual memory: request paging system,request segmentation system and request segmentation with paging system.Request paging system is a realization of virtual memory which increases request paging function and page replacement function on the basis of pure paging system.This paper analyzes the existing problems of page replacement algorithm,and proposes a new indicator to weigh the pros and cons of page replacement algorithm-page replacement rate.