随机确定内存大小，页面数，进程的个数，每个进程的页数，给进程分配的页面数。要求计算缺页次数，缺页率，被淘汰的序列。-ramdom get memory size, page mumber, process number, page number for each page, allocated page number for the process. To calculate the page lacking number, page missing rate, wash out sequenc