以下有三题简答题，请问有没有高手可以帮忙解一下!感谢!!!!! 1.Pipelining is often explained using some illustration similar to the diagram below, which illustrates a four-stage instruction pipeline. Can you devise an illustration, based on the same notion, to demonstrate the operation of a 3-way superscalar(four-stage) instruction pipeline at its maximum efficiency. What is the maximum possible performance gain over the basic pipeline structure? [图] TIME---------------------------> IF ID EX WB IF ID EX WB IF ID EX WB IF ID EX WB (我想问的是，通常在一个机器周期下，一个指令会被分为下列五个步骤来执行 IF-ID-EX-MEM-WB，可是在这个图里少了MEM，所以这个题目是不是要我举个只有四个步骤 的基本管线结构的最大可能表现获取?) 2.A basic time model that is widely used in evaluating processor is clocks per instrction(CPI). A processor has two classes of instructions: class A instructions take two clocks to execute whereas class B instuctions take three clocks to execute. Of all the instruction execute, 75% are class A instructions and 25% are class B instructions. What is the CPI of this processor? 3.A multiplattered hard disk is divided into 40 sectors and 400 cylinders. There are four platter surfaces. The total capacity of the disk is 128MB. A cluster consists of 4 sectors. The disk is rotating at a rate of 5400 rpm. The disk has an average seek time of 12 msec. (A)What is the capacity of a cluster for this disk? (B)What is the average access time before starting data transfer? (C)What is the maximal disk transfer rate in bytes per second? (请问这第三题要怎麽算?) --

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