<html xmlns="http://www.w3.org/1999/xhtml"><head><meta charset="utf-8"><meta name="generator" content="pdf2htmlEX"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/css/base.min.css"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/css/fancy.min.css"><link rel="stylesheet" href="https://csdnimg.cn/release/download_crawler_static/6917767/raw.css"><script src="https://csdnimg.cn/release/download_crawler_static/js/compatibility.min.js"></script><script src="https://csdnimg.cn/release/download_crawler_static/js/pdf2htmlEX.min.js"></script><script>try{pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({});}catch(e){}</script><title></title></head><body><div id="sidebar" style="display: none"><div id="outline"></div></div><div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://csdnimg.cn/release/download_crawler_static/6917767/bg1.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">操作系统实验报告</div><div class="t m0 x2 h4 y3 ff1 fs1 fc0 sc1 ls0 ws0">一、<span class="_"> </span>基本信息</div><div class="t m0 x3 h4 y4 ff2 fs1 fc0 sc1 ls0 ws0">1<span class="ff1">、<span class="_ _0"> </span>实验题目：</span> <span class="ff1">实验三</span> <span class="ff1">存储管理</span></div><div class="t m0 x3 h4 y5 ff2 fs1 fc0 sc1 ls0 ws0">2<span class="ff1">、<span class="_ _0"> </span>完成人</span>: </div><div class="t m0 x3 h4 y6 ff2 fs1 fc0 sc1 ls0 ws0">3<span class="ff1">、<span class="_ _0"> </span>报告日期：</span></div><div class="t m0 x2 h4 y7 ff1 fs1 fc0 sc1 ls0 ws0">二、<span class="_"> </span>实验内容简要描述</div><div class="t m0 x3 h4 y8 ff2 fs1 fc0 sc1 ls0 ws0">1<span class="ff1">、<span class="_ _0"> </span>实验目标</span></div><div class="t m0 x2 h4 y9 ff2 fs1 fc0 sc1 ls0 ws0"> <span class="_ _1"></span> <span class="_ _1"></span> <span class="_ _1"></span><span class="ff1">存储<span class="_ _1"></span>管理的<span class="_ _1"></span>主要功<span class="_ _1"></span>能之一<span class="_ _1"></span>是合理<span class="_ _1"></span>地分<span class="_ _1"></span>配空间<span class="_ _1"></span>。请求<span class="_ _1"></span>页式<span class="_ _1"></span>管理是<span class="_ _1"></span>一</span></div><div class="t m0 x2 h4 ya ff1 fs1 fc0 sc1 ls0 ws0">种常用的虚拟存储管理技术。</div><div class="t m0 x2 h4 yb ff2 fs1 fc0 sc1 ls0 ws0"> <span class="_ _1"></span> <span class="_ _1"></span> <span class="_ _2"></span><span class="ff1">本<span class="_ _1"></span>实验<span class="_ _1"></span>的目<span class="_ _1"></span>的<span class="_ _1"></span>是通<span class="_ _1"></span>过<span class="_ _1"></span>请求<span class="_ _1"></span>页式<span class="_ _1"></span>存<span class="_ _1"></span>储管<span class="_ _1"></span>理<span class="_ _1"></span>中页<span class="_ _1"></span>面<span class="_ _1"></span>置换<span class="_ _1"></span>算<span class="_ _1"></span>法模<span class="_ _1"></span>拟设<span class="_ _1"></span>计<span class="_ _3"></span>，</span></div><div class="t m0 x2 h4 yc ff1 fs1 fc0 sc1 ls0 ws0">了解虚拟存储技术的特点，掌握请求页式管理的页面置换算法。</div><div class="t m0 x3 h4 yd ff2 fs1 fc0 sc1 ls0 ws0">2<span class="ff1">、<span class="_ _0"> </span>实验要求</span></div><div class="t m0 x3 h4 ye ff2 fs1 fc0 sc1 ls0 ws0">1)<span class="_ _4"> </span><span class="ff1">通<span class="_ _1"></span>过<span class="_ _1"></span>随<span class="_ _1"></span>机<span class="_ _1"></span>数<span class="_ _1"></span>产<span class="_ _1"></span>生<span class="_ _1"></span>一<span class="_ _1"></span>个<span class="_ _2"></span>指<span class="_ _1"></span>令<span class="_ _1"></span>序<span class="_ _1"></span>列<span class="_ _1"></span>，<span class="_ _1"></span>共<span class="_ _5"> </span></span>320<span class="_ _6"> </span><span class="ff1">条<span class="_ _1"></span>指<span class="_ _1"></span>令<span class="_ _1"></span>，<span class="_ _1"></span>指<span class="_ _1"></span>令<span class="_ _1"></span>的<span class="_ _1"></span>地<span class="_ _1"></span>址</span></div><div class="t m0 x4 h4 yf ff1 fs1 fc0 sc1 ls0 ws0">按下述原则生成：</div><div class="t m0 x5 h4 y10 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> 50%<span class="ff1">的指令是顺序执行的；</span></span></div><div class="t m0 x6 h4 y11 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> 25%<span class="ff1">的指令是均匀分布在前地址部分。</span></span></div><div class="t m0 x6 h4 y12 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> 25%<span class="ff1">的指令是均匀分布在后地址部分。</span></span></div><div class="t m0 x6 h4 y13 ff1 fs1 fc0 sc1 ls0 ws0">具体的实施办法是：</div><div class="t m0 x5 h4 y14 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">在</span>[0<span class="ff1">，</span>319]<span class="ff1">的指令地址之间随机选取一点<span class="_ _7"> </span></span>m<span class="ff1">；</span></span></div><div class="t m0 x6 h4 y15 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">顺序执行一条指令，即执行地址为<span class="_ _7"> </span></span>m+1<span class="_ _7"> </span><span class="ff1">的指令；</span></span></div><div class="t m0 x6 h4 y16 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">在<span class="_ _1"></span>前地址<span class="_ _1"></span></span>[0<span class="ff1">，<span class="_ _1"></span></span>m+1]<span class="ff1">中随机选<span class="_ _1"></span>取一条指<span class="_ _1"></span>令并执行<span class="_ _1"></span>，该指令的<span class="_ _1"></span>地</span></span></div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div></body></html>
<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://csdnimg.cn/release/download_crawler_static/6917767/bg2.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x2 h4 y17 ff1 fs1 fc0 sc1 ls0 ws0">址为<span class="_ _7"> </span><span class="ff2">m’</span>；</div><div class="t m0 x6 h4 y18 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">顺序执行一条指令，其地址为<span class="_ _7"> </span></span>m’+1<span class="ff1">；</span></span></div><div class="t m0 x6 h4 y3 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">在后地址</span>[m<span class="ff4">’</span>+2<span class="ff1">，</span>319]<span class="ff1">中随机选取一条指令并执行；</span></span></div><div class="t m0 x6 h4 y4 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">重复上述步骤</span></span><span class="ff1">——</span><span class="ff1">，直到执行<span class="_ _7"> </span><span class="ff2">320<span class="_ _7"> </span></span>次指令。</span></div><div class="t m0 x3 h4 y5 ff2 fs1 fc0 sc1 ls0 ws0">2)<span class="_ _4"> </span><span class="ff1">将指令序列变换成页地址流</span></div><div class="t m0 x3 h4 y6 ff1 fs1 fc0 sc1 ls0 ws0">设：</div><div class="t m0 x5 h4 y7 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">页面大小为<span class="_ _7"> </span></span>1K<span class="ff1">；</span></span></div><div class="t m0 x6 h4 y8 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">用户内存容量为<span class="_ _7"> </span></span>4<span class="_ _7"> </span><span class="ff1">页到<span class="_ _7"> </span></span>32<span class="_ _7"> </span><span class="ff1">页；</span></span></div><div class="t m0 x6 h4 y9 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">用户虚存容量为<span class="_ _7"> </span></span>32K<span class="ff1">；</span></span></div><div class="t m0 x7 h4 ya ff2 fs1 fc0 sc1 ls0 ws0"> <span class="_ _1"></span><span class="ff1">在用户<span class="_ _1"></span>虚存中<span class="_ _1"></span>，按<span class="_ _1"></span>每<span class="_ _7"> </span></span>K<span class="_ _6"> </span><span class="ff1">存放<span class="_ _7"> </span></span>10<span class="_ _6"> </span><span class="ff1">条指<span class="_ _1"></span>令排列<span class="_ _1"></span>虚存地<span class="_ _1"></span>址，<span class="_ _1"></span>即<span class="_ _6"> </span></span>320<span class="_ _7"> </span><span class="ff1">条</span></div><div class="t m0 x8 h4 yb ff1 fs1 fc0 sc1 ls0 ws0">指令在虚存中的存放方式为：</div><div class="t m0 x7 h4 yc ff2 fs1 fc0 sc1 ls0 ws0"> <span class="ff1">第<span class="_ _7"> </span></span>0<span class="_ _7"> </span><span class="ff1">条</span>-9<span class="_ _7"> </span><span class="ff1">条指令为第<span class="_ _7"> </span></span>0<span class="_ _7"> </span><span class="ff1">页（对应虚存地址为</span>[0<span class="ff1">，</span>9]<span class="ff1">）；</span></div><div class="t m0 x7 h4 yd ff2 fs1 fc0 sc1 ls0 ws0"> <span class="_ _8"> </span> <span class="_"> </span> <span class="_ _8"> </span> <span class="_ _6"> </span><span class="ff1">第<span class="_ _9"> </span></span>10<span class="_ _9"> </span><span class="ff1">条<span class="_ _6"> </span></span>-<span class="_ _6"> </span><span class="ff1">第<span class="_ _9"> </span></span>19<span class="_ _9"> </span><span class="ff1">条<span class="_ _6"> </span>指<span class="_ _6"> </span>令<span class="_ _6"> </span>为<span class="_ _6"> </span>第<span class="_ _6"> </span>一<span class="_ _6"> </span>页<span class="_ _6"> </span>（<span class="_ _6"> </span>对<span class="_ _6"> </span>应<span class="_ _a"> </span>虚<span class="_ _6"> </span>存<span class="_ _6"> </span>地<span class="_ _6"> </span>址<span class="_ _6"> </span>为</span></div><div class="t m0 x8 h4 ye ff2 fs1 fc0 sc1 ls0 ws0">[10<span class="ff1">，</span>19]<span class="ff1">）；</span></div><div class="t m0 x7 h5 y19 ff2 fs1 fc0 sc1 ls0 ws0">…………</div><div class="t m0 x7 h4 y1a ff2 fs1 fc0 sc1 ls0 ws0"> <span class="_"> </span> <span class="_ _7"> </span> <span class="_"> </span> <span class="_ _7"> </span><span class="ff1">第<span class="_ _b"> </span></span>310<span class="_ _b"> </span><span class="ff1">条<span class="_ _7"> </span></span>-<span class="_ _c"> </span><span class="ff1">第<span class="_ _b"> </span></span>319<span class="_ _d"> </span><span class="ff1">条<span class="_ _c"> </span>指<span class="_ _7"> </span>令<span class="_ _c"> </span>为<span class="_ _c"> </span>第<span class="_ _e"> </span></span>31<span class="_ _b"> </span><span class="ff1">页<span class="_ _7"> </span>（<span class="_ _c"> </span>对<span class="_ _c"> </span>应<span class="_ _7"> </span>虚<span class="_ _c"> </span>存<span class="_ _f"> </span>地<span class="_ _c"> </span>址<span class="_ _f"> </span>为</span></div><div class="t m0 x8 h4 y1b ff2 fs1 fc0 sc1 ls0 ws0">[310<span class="ff1">，</span>319]<span class="ff1">）；<span class="_ _10"> </span></span> </div><div class="t m0 x6 h4 y1c ff1 fs1 fc0 sc1 ls0 ws0">按以上方式，用户指令可组成<span class="_ _7"> </span><span class="ff2">32<span class="_ _7"> </span></span>页。</div><div class="t m0 x3 h4 y1d ff2 fs1 fc0 sc1 ls0 ws0">3)<span class="_ _4"> </span><span class="ff1">计算并输出下述各种算法在不同内存容量下的命中率。</span></div><div class="t m0 x6 h4 y1e ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">先进先出的算法（</span>FIFO<span class="ff1">）；</span></span></div><div class="t m0 x6 h4 y1f ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">最近最少使用算法（</span>LRR<span class="ff1">）；</span></span></div><div class="t m0 x6 h4 y20 ff3 fs1 fc0 sc1 ls0 ws0"><span class="ff2"> <span class="ff1">最佳淘汰算法（</span>OPT<span class="ff1">）；先淘汰最不常用的页地址；</span></span></div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>
<div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://csdnimg.cn/release/download_crawler_static/6917767/bg3.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x6 h4 y17 ff1 fs1 fc0 sc1 ls0 ws0">命中率<span class="ff2">=1-</span>页面失效次数<span class="ff2">/</span>页地址流长度</div><div class="t m0 x6 h4 y18 ff1 fs1 fc0 sc1 ls0 ws0">在<span class="_ _1"></span>本<span class="_ _1"></span>实<span class="_ _1"></span>验<span class="_ _1"></span>中<span class="_ _1"></span>，<span class="_ _1"></span>页<span class="_ _1"></span>地<span class="_ _1"></span>址<span class="_ _2"></span>流<span class="_ _1"></span>长<span class="_ _1"></span>度<span class="_ _1"></span>为<span class="_ _6"> </span><span class="ff2">320<span class="_ _1"></span></span>，<span class="_ _1"></span>页<span class="_ _1"></span>面<span class="_ _1"></span>失<span class="_ _2"></span>效<span class="_ _1"></span>次<span class="_ _1"></span>数<span class="_ _1"></span>为<span class="_ _1"></span>每<span class="_ _1"></span>次<span class="_ _1"></span>访<span class="_ _1"></span>问</div><div class="t m0 x2 h4 y3 ff1 fs1 fc0 sc1 ls0 ws0">相应指令时，该指令所对应的页不在内存的次数。</div><div class="t m0 x2 h4 y21 ff1 fs1 fc0 sc1 ls0 ws0">三、<span class="_"> </span>报告主要内容</div><div class="t m0 x3 h4 y22 ff2 fs1 fc0 sc1 ls0 ws0">1<span class="ff1">、<span class="_ _0"> </span>设计思路</span></div><div class="t m0 x3 h4 y23 ff2 fs1 fc0 sc1 ls0 ws0">(1)<span class="ff1">先<span class="_ _1"></span>进先<span class="_ _1"></span>出<span class="_ _1"></span>的<span class="_ _1"></span>算法<span class="_ _1"></span>（<span class="_ _2"></span></span>FIFO<span class="ff1">）<span class="_ _1"></span></span>:<span class="_ _1"></span><span class="ff1">把<span class="_ _1"></span>内<span class="_ _1"></span>存<span class="_ _1"></span>的块<span class="_ _1"></span>设<span class="_ _1"></span>置<span class="_ _1"></span>成一<span class="_ _1"></span>个<span class="_ _1"></span>队<span class="_ _1"></span>列，<span class="_ _1"></span>当<span class="_ _1"></span>内</span></div><div class="t m0 x3 h4 y24 ff1 fs1 fc0 sc1 ls0 ws0">存中有对应<span class="_ _1"></span>的页时，不进行记录，<span class="_ _1"></span>若没有则从队列的<span class="_ _1"></span>首部进行出</div><div class="t m0 x3 h4 y25 ff1 fs1 fc0 sc1 ls0 ws0">列，将新的页加在队列的后面。</div><div class="t m0 x3 h4 y26 ff2 fs1 fc0 sc1 ls0 ws0">(2)<span class="ff1">最<span class="_ _1"></span>近<span class="_ _1"></span>最<span class="_ _1"></span>少<span class="_ _1"></span>使<span class="_ _1"></span>用<span class="_ _1"></span>算<span class="_ _1"></span>法<span class="_ _1"></span>（<span class="_ _11"></span></span>LRR<span class="_ _1"></span><span class="ff1">）<span class="_ _1"></span></span>:<span class="_ _1"></span><span class="ff1">将<span class="_ _2"></span>内<span class="_ _1"></span>存<span class="_ _1"></span>块<span class="_ _1"></span>设<span class="_ _1"></span>置<span class="_ _1"></span>成<span class="_ _1"></span>一<span class="_ _1"></span>个<span class="_ _1"></span>栈<span class="_ _1"></span>，<span class="_ _1"></span>若<span class="_ _2"></span>栈<span class="_ _1"></span>中</span></div><div class="t m0 x3 h4 y27 ff1 fs1 fc0 sc1 ls0 ws0">有相应的页<span class="_ _1"></span>，则将该页放到栈顶，<span class="_ _1"></span>栈底为最远用到的<span class="_ _1"></span>内存块，没</div><div class="t m0 x3 h4 y28 ff1 fs1 fc0 sc1 ls0 ws0">有对应页时<span class="_ _1"></span>将其出栈，将要用的页<span class="_ _1"></span>进入栈顶，其他块<span class="_ _1"></span>顺次向下移</div><div class="t m0 x3 h4 y29 ff1 fs1 fc0 sc1 ls0 ws0">动。</div><div class="t m0 x3 h4 y2a ff2 fs1 fc0 sc1 ls0 ws0">(3)<span class="ff1">最佳淘<span class="_ _1"></span>汰算<span class="_ _1"></span>法（<span class="_ _1"></span></span>OPT<span class="_ _1"></span><span class="ff1">）；<span class="_ _1"></span>先淘汰<span class="_ _1"></span>最不常<span class="_ _1"></span>用的页<span class="_ _1"></span>地址<span class="_ _12"> </span></span>:<span class="ff1">将<span class="_ _1"></span>每个页</span></div><div class="t m0 x3 h4 y2b ff1 fs1 fc0 sc1 ls0 ws0">设置一个记<span class="_ _1"></span>录，每执行一次记录一<span class="_ _1"></span>次，若内存块中没<span class="_ _1"></span>有对应的页<span class="_ _11"></span>，</div><div class="t m0 x3 h4 y1a ff1 fs1 fc0 sc1 ls0 ws0">比较记录此时，把数字最小的出栈。</div><div class="t m0 x3 h4 y1b ff2 fs1 fc0 sc1 ls0 ws0">2<span class="ff1">、<span class="_ _0"> </span>主要代码段分析</span></div><div class="t m0 x3 h4 y1c ff1 fs1 fc0 sc1 ls0 ws0">先进先出的算法（<span class="ff2">FIFO</span>）：</div><div class="t m0 x3 h6 y2c ff2 fs2 fc0 sc1 ls0 ws0">float f1(int j)</div><div class="t m0 x3 h6 y2d ff2 fs2 fc0 sc1 ls0 ws0">{</div><div class="t m0 x4 h6 y2e ff2 fs2 fc0 sc1 ls0 ws0">srand(time(0));</div><div class="t m0 x4 h6 y2f ff2 fs2 fc0 sc1 ls0 ws0">int a[320],b[32]={-1};</div><div class="t m0 x4 h6 y30 ff2 fs2 fc0 sc1 ls0 ws0">int i,x,y<span class="_ _13"></span>,times=0,have,bp=0;</div><div class="t m0 x4 h6 y31 ff2 fs2 fc0 sc1 ls0 ws0">float z,ftimes=0;</div><div class="t m0 x4 h6 y32 ff2 fs2 fc0 sc1 ls0 ws0">for(i=0;i<320;i++)</div><div class="t m0 x4 h6 y33 ff2 fs2 fc0 sc1 ls0 ws0">{</div><div class="t m0 x9 h6 y34 ff2 fs2 fc0 sc1 ls0 ws0">a[i]=i/10;</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>
<div id="pf4" class="pf w0 h0" data-page-no="4"><div class="pc pc4 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://csdnimg.cn/release/download_crawler_static/6917767/bg4.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x4 h7 y35 ff2 fs2 fc0 sc1 ls0 ws0">}//<span class="ff1">分页</span></div><div class="t m0 x4 h6 y36 ff2 fs2 fc0 sc1 ls0 ws0">for(;;)</div><div class="t m0 x4 h6 y37 ff2 fs2 fc0 sc1 ls0 ws0">{</div><div class="t m0 x9 h6 y38 ff2 fs2 fc0 sc1 ls0 ws0">have=0;</div><div class="t m0 x9 h7 y39 ff2 fs2 fc0 sc1 ls0 ws0">x=rand()%319;//<span class="ff1">随机取数</span></div><div class="t m0 x9 h7 y3a ff2 fs2 fc0 sc1 ls0 ws0">times=times+1;<span class="_ _14"> </span>//<span class="ff1">记录次数</span></div><div class="t m0 x9 h6 y3b ff2 fs2 fc0 sc1 ls0 ws0">for(i=0;i<j;i++)</div><div class="t m0 x9 h6 y3c ff2 fs2 fc0 sc1 ls0 ws0">{</div><div class="t m0 xa h6 y3d ff2 fs2 fc0 sc1 ls0 ws0">if(b[i]==a[x+1])</div><div class="t m0 xa h6 y3e ff2 fs2 fc0 sc1 ls0 ws0">{</div><div class="t m0 xb h6 y3f ff2 fs2 fc0 sc1 ls0 ws0">have=have+1;</div><div class="t m0 xa h6 y40 ff2 fs2 fc0 sc1 ls0 ws0">}</div><div class="t m0 x9 h7 y41 ff2 fs2 fc0 sc1 ls0 ws0">}//<span class="ff1">遍历内存块看是否有无页在内</span></div><div class="t m0 x9 h6 y42 ff2 fs2 fc0 sc1 ls0 ws0">if(have==0)</div><div class="t m0 x9 h6 y43 ff2 fs2 fc0 sc1 ls0 ws0">{</div><div class="t m0 xa h6 y44 ff2 fs2 fc0 sc1 ls0 ws0">b[bp%j]=a[x+1];</div><div class="t m0 xa h6 y45 ff2 fs2 fc0 sc1 ls0 ws0">bp=bp+1;</div><div class="t m0 x3 h6 y46 ff2 fs2 fc0 sc1 ls0 ws0"> ftimes=ftimes+1;</div><div class="t m0 x9 h7 y47 ff2 fs2 fc0 sc1 ls0 ws0">}//<span class="ff1">内存中没有对应页，对首出栈</span></div><div class="t m0 x9 h6 y48 ff2 fs2 fc0 sc1 ls0 ws0">y=x;</div><div class="t m0 x9 h6 y49 ff2 fs2 fc0 sc1 ls0 ws0">have=0;</div><div class="t m0 x9 h6 y4a ff2 fs2 fc0 sc1 ls0 ws0">if(times==320)</div><div class="t m0 x9 h6 y4b ff2 fs2 fc0 sc1 ls0 ws0">{</div><div class="t m0 xa h6 y4c ff2 fs2 fc0 sc1 ls0 ws0">break;</div><div class="t m0 x9 h7 y4d ff2 fs2 fc0 sc1 ls0 ws0">}<span class="_ _15"> </span>//<span class="ff1">判定是否执行<span class="_ _c"> </span></span>320<span class="_ _c"> </span><span class="ff1">次</span></div><div class="t m0 x4 h7 y4e ff2 fs2 fc0 sc1 ls0 ws0"> x=rand()%y;//<span class="ff1">再一次按要求取数</span></div><div class="t m0 x9 h6 y4f ff2 fs2 fc0 sc1 ls0 ws0">times=times+1;</div><div class="t m0 x9 h6 y50 ff2 fs2 fc0 sc1 ls0 ws0">for(i=0;i<j;i++)</div><div class="t m0 x9 h6 y51 ff2 fs2 fc0 sc1 ls0 ws0">{</div><div class="t m0 xa h6 y52 ff2 fs2 fc0 sc1 ls0 ws0">if(b[i]==a[x+1])</div><div class="t m0 xa h6 y53 ff2 fs2 fc0 sc1 ls0 ws0">{</div><div class="t m0 xb h6 y54 ff2 fs2 fc0 sc1 ls0 ws0">have=have+1;</div><div class="t m0 xa h6 y55 ff2 fs2 fc0 sc1 ls0 ws0">}</div><div class="t m0 x9 h6 y56 ff2 fs2 fc0 sc1 ls0 ws0">}</div><div class="t m0 x9 h6 y57 ff2 fs2 fc0 sc1 ls0 ws0">if(have==0)</div><div class="t m0 x9 h6 y2c ff2 fs2 fc0 sc1 ls0 ws0">{</div><div class="t m0 xa h6 y2d ff2 fs2 fc0 sc1 ls0 ws0">b[bp%j]=a[x+1];</div><div class="t m0 xa h6 y2e ff2 fs2 fc0 sc1 ls0 ws0">bp=bp+1;</div><div class="t m0 x3 h6 y2f ff2 fs2 fc0 sc1 ls0 ws0"> ftimes=ftimes+1;</div><div class="t m0 x9 h6 y30 ff2 fs2 fc0 sc1 ls0 ws0">}</div><div class="t m0 x9 h6 y31 ff2 fs2 fc0 sc1 ls0 ws0">y=x;</div><div class="t m0 x9 h6 y32 ff2 fs2 fc0 sc1 ls0 ws0">have=0;</div><div class="t m0 x9 h6 y33 ff2 fs2 fc0 sc1 ls0 ws0">if(times==320)</div><div class="t m0 x9 h6 y34 ff2 fs2 fc0 sc1 ls0 ws0">{</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>
