说明

1.模拟页式存储，请求调页采用FIFO算法

2.320条指令的执行顺序生成

随机生成一个0-319的整数，每连续两条指令与该随机数开始的两条指令交换，循环320/2=160次完成

3.这样的执行顺序随机生成方法，首先能保证每条指令都被执行，而且打乱程度较高同时有保留了一些连续指令，从命中率看在0.24左右

-Note 1. Simulation page storage, the request paging algorithm using FIFO execution order of 2.320 of instructions to generate a 0-319 to generate a random integer, each of two consecutive instructions begin with the random exchange of the two directives, circular 320/2 = 160 completed 3. This method of randomly generated sequence of implementation, first of all to ensure that each command have been implemented, and also have retained a higher degree of disruption of a number of consecutive instructions, read from the shooting at around 0.24