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</a></li></ul></li></ul></div></div> <!----></nav>  <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>进程调度</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/OS_lab_tutorial/Linux/Lab/Lab3/" aria-current="page" class="active sidebar-link">任务说明</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Lab/Lab3/#前言" class="sidebar-link">前言</a></li><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Lab/Lab3/#一、实验目的" class="sidebar-link">一、实验目的</a></li><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Lab/Lab3/#二、实验步骤" class="sidebar-link">二、实验步骤</a></li><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Lab/Lab3/#课外资料" class="sidebar-link">课外资料</a></li></ul></li><li><a href="/OS_lab_tutorial/Linux/Lab/Lab3/RR.html" class="sidebar-link">RR调度算法</a></li><li><a href="/OS_lab_tutorial/Linux/Lab/Lab3/SJF.html" class="sidebar-link">SJF调度算法</a></li><li><a href="/OS_lab_tutorial/Linux/Lab/Lab3/CFS.html" class="sidebar-link">CFS调度算法</a></li><li><a href="/OS_lab_tutorial/Linux/Lab/Lab3/MLFQ.html" class="sidebar-link">MLFQ调度算法</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="实验三-进程调度"><a href="#实验三-进程调度" class="header-anchor">#</a> 实验三 - 进程调度</h1> <h2 id="前言"><a href="#前言" class="header-anchor">#</a> 前言</h2> <p>（1）为什么要引入进程调度？</p> <p>（2）主要针对单核处理机的调度算法做研究</p> <p>（3）历史发展脉络</p> <p>（4）进程调度的性能指标是什么</p> <p>（5）进程切换</p> <p>（6）进程调度的实现</p> <h2 id="一、实验目的"><a href="#一、实验目的" class="header-anchor">#</a> 一、实验目的</h2> <p>	操作系统的内核中实现的调度器比较复杂，其本质组成就是3大模块：就绪队列、调度器、分配器。</p> <p>	在本次实验中，三者之中的就绪队列将会作为参数提供给你，你需要实现的是调度器，然后由系统本身实现的分配器调用你事先的调度器，以检验算法的正确性。</p> <p>	实现调度器的最困难的地方在于实现调度算法（抛开提高性能、降低耦合性等事实不谈），请你结合实验教程完成调度算法的实现，并按照规范实现程序接口，以保证整个系统能够运行。</p> <h2 id="二、实验步骤"><a href="#二、实验步骤" class="header-anchor">#</a> 二、实验步骤</h2> <h3 id="_1-进程控制块-pcb-结构"><a href="#_1-进程控制块-pcb-结构" class="header-anchor">#</a> 1. 进程控制块(PCB)结构</h3> <p>	进程控制块（PCB）是操作系统中用于管理和描述进程的数据结构。它存储了一个进程的相关信息，包括进程状态、程序计数器、寄存器值、内存分配信息、打开的文件列表等。</p> <p>	在本次实验中，我们已经帮你设计好了PCB，你需要理解PCB中的每个变量的作用以及意义，在此基础上实现调度算法，并通过实验数据测试。</p> <p>	下面是我们规定的PCB结构体：</p> <div class="language-cpp extra-class"><pre class="language-cpp"><code><span class="token keyword">struct</span> <span class="token class-name">PCB</span> <span class="token punctuation">{</span>
    <span class="token keyword">int</span> pid<span class="token punctuation">;</span>                 <span class="token comment">// 进程ID</span>
    string name<span class="token punctuation">;</span>             <span class="token comment">// 进程名称</span>
    string state<span class="token punctuation">;</span>            <span class="token comment">// 进程状态 (一般来说 就绪队列里面的进程都是Ready状态)</span>
    <span class="token keyword">int</span> priority<span class="token punctuation">;</span>            <span class="token comment">// 进程优先级</span>
    <span class="token keyword">int</span> burst_time<span class="token punctuation">;</span>          <span class="token comment">// 进程的执行时间</span>
    <span class="token keyword">int</span> remain_time<span class="token punctuation">;</span>         <span class="token comment">// 剩余执行时间</span>
    <span class="token keyword">int</span> arrive_time<span class="token punctuation">;</span>         <span class="token comment">// 进程到达时间</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div><p>	该结构体具有上述变量。对于不同的编程语言，变量名称都与上面的代码一致。</p> <h3 id="_2-调度策略"><a href="#_2-调度策略" class="header-anchor">#</a> 2. 调度策略</h3> <p>	在这一步，你需要根据不同的调度策略设计响应的调度算法，调度策略有以下几种：</p> <ul><li><p>FCFS（First Come First Serve）</p></li> <li><p>RR（Round-Robin，轮转调度）</p></li> <li><p>SJF（Shortest Job First，最短作业优先）</p></li> <li><p>MLFQ（多级反馈队列调度）</p></li> <li><p>CFS（Completely Fair Scheduler，完全公平调度器）</p></li></ul> <p>	请跳转到响应的实验教程中继续完成实验。</p> <h2 id="课外资料"><a href="#课外资料" class="header-anchor">#</a> 课外资料</h2></div> <footer class="page-edit"><!----> <!----></footer> <div class="page-nav"><p class="inner"><!----> <span class="next"><a href="/OS_lab_tutorial/Linux/Lab/Lab3/RR.html">
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