| 1 |
- (window.webpackJsonp=window.webpackJsonp||[]).push([[27],{302:function(t,s,a){t.exports=a.p+"assets/img/RR-result.975d3019.png"},348:function(t,s,a){"use strict";a.r(s);var n=a(14),r=Object(n.a)({},(function(){var t=this,s=t._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[s("h1",{attrs:{id:"完全公平调度算法"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#完全公平调度算法"}},[t._v("#")]),t._v(" 完全公平调度算法")]),t._v(" "),s("h2",{attrs:{id:"调度策略与算法原理"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#调度策略与算法原理"}},[t._v("#")]),t._v(" 调度策略与算法原理")]),t._v(" "),s("p",[t._v("\tRR（Round-Robin，轮转调度）是一种常见的进程调度策略，它以时间片（固定时间段）为单位，依次为每个进程分配CPU时间。每个进程在就绪队列中按照到达顺序排队，并且每个进程都能够在一个时间片内获得一定的CPU执行时间，然后被放回队列尾部继续等待执行。")]),t._v(" "),s("p",[t._v("基本原则和策略：")]),t._v(" "),s("ol",[s("li",[t._v("时间片：RR调度策略将CPU时间划分为固定的时间片。当一个进程获得CPU执行时，它被允许执行一个时间片的长度，然后被放回队列等待下一次执行。")]),t._v(" "),s("li",[t._v("队列调度：进程按照到达顺序排队在就绪队列中，每个进程依次获得执行机会。当一个进程的时间片用完后，==它被放回队列的尾部==，下一个进程开始执行。")]),t._v(" "),s("li",[t._v("循环执行：RR调度策略按照循环的方式执行进程，每个进程都能获得一定的CPU时间，以确保公平性。")]),t._v(" "),s("li",[t._v("非抢占式调度：一个进程在执行过程中不会被强制中断或抢占，直到它的时间片用完。")])]),t._v(" "),s("p",[t._v("\tRR调度策略具有公平性和响应性，因为每个进程都能获得一定的执行时间，并且长时间运行的进程不会占用所有的CPU时间。然而，如果时间片过小，会导致频繁的上下文切换，增加系统开销；如果时间片过大，会影响系统对紧急任务的响应时间。")]),t._v(" "),s("p",[t._v("\tRR调度策略在操作系统中被广泛应用，尤其是在分时系统和交互式系统中，它能够合理分配CPU时间，提供良好的用户体验。")]),t._v(" "),s("h2",{attrs:{id:"实验步骤"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#实验步骤"}},[t._v("#")]),t._v(" 实验步骤")]),t._v(" "),s("p",[t._v("\t以下实验编写的属于单进程运行的程序，难以展现出操作系统内核中真实情况下并行计算的场景。不过作者希望通过模拟该算法的实现，学生能够体会到RR进程调度的算法步骤以及特点。")]),t._v(" "),s("p",[t._v("（1）我们设计一个系统内通用的进程控制块，保存进程的所有数据，包括但不限于以下内容：")]),t._v(" "),s("div",{staticClass:"language-cpp extra-class"},[s("pre",{pre:!0,attrs:{class:"language-cpp"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("struct")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Process")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token 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进程的总共需要执行时间(为了模拟进程运行而做出的假设)")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n")])])]),s("p",[t._v("（2）我们不仅仅需要模拟RR调度算法，还需要模拟在调度过程中操作系统为RR调度器提供了什么样的帮助，比如在下面的实现中，就使用了CPU时间（无需复制该代码，该代码在第3点的scheduleRR函数中）：")]),t._v(" "),s("div",{staticClass:"language-cpp extra-class"},[s("pre",{pre:!0,attrs:{class:"language-cpp"}},[s("code",[s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* 操作系统的变量 */")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("int")]),t._v(" current_cpu_time "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("0")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// 假设目前系统刚刚启动，时间为0")]),t._v("\n")])])]),s("p",[t._v("（3）调度算法的实现：")]),t._v(" "),s("div",{staticClass:"language-cpp 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