实现虚拟存储器能给用户提供一个容量很大的存储空间,采用OPT、FIFO、LRU等页面淘汰算法，模拟操作系统的页面置换过程，并计算出页面缺页率.-virtual memory can provide users with a large capacity of storage space, use of OPT, FIFO, LRU algorithm eliminated, and other pages, the pages simulation operating system replac