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<title>操作系统－第六章</title>
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<td width="100%" align="center" height="53" colspan="2"><font color="#FFFFFF"><font size="5" face="黑体"><font LANG="ZH-CN">第六章</font>
操作系统引论
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<p align="center"><font color="#FFFFFF"><span style="mso-bidi-font-size: 10.0pt"><a href="#ch61"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">6</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">.</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">1<span style="mso-spacerun: yes; mso-bidi-font-size: 10.0pt">
</span></span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">虚拟存储器的基本概念</span></a></span></font><font color="#FFFFFF"><span style="mso-bidi-font-size: 10.0pt"><a href="#ch61"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
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<p style="TEXT-ALIGN: center" align="center"><font color="#FFFFFF"><a href="#ch62"><span style="mso-spacerun: yes; mso-bidi-font-size: 10.0pt">6.2
请求页式存储管理方式</span></a></font></p>
<p align="center"><font color="#FFFFFF"><a href="#ch63"><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">
6.3 页面置换算法</span></a></font>
<p align="center"><font color="#FFFFFF"><span style="mso-bidi-font-size: 10.0pt"><a href="#ch64"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">6.4
请求分页系统的性能分析</span></span></a><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
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<p ALIGN="center" style="margin-top: 10"><font color="#FFFFFF"><span style="mso-bidi-font-size: 10.0pt"><a href="#ch65"><span style="mso-bidi-font-size: 10.0pt" lang="EN-US">6</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">.</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">5<span style="mso-spacerun: yes; mso-bidi-font-size: 10.0pt">
</span></span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">请求分段存储管理方式</span></a></span></font>
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<td width="18%" align="center" height="39"><font LANG="ZH-CN" color="#FFFFFF">作业：</font></td>
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<td width="114%" align="center" height="39" colspan="2"><a href="index.htm"><font color="#FFFFFF">返回<<</font></a></td>
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<p align="center"><font color="#FFFFFF"> <span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><a name="ch61"></a>6</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">．</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">1<span style="mso-spacerun: yes">
</span></span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">虚拟存储器的基本概念</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
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<p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l13 level1 lfo13; tab-stops: list 18.0pt"><font color="#FFFFFF"><span lang="EN-US">1．</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">虚拟存储器的引入：</span></font></p>
<p style="MARGIN-LEFT: 18pt"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font color="#FFFFFF">⑴虚拟存储器的设想（基本原理）：当成需要运行时，不是讲它的全部信息装入主存，而是将其中一部分装入主存，另外一部分暂时留在辅存中，程序运行到不在主存的信息时再设法将它们装入主存，保证程序的正常运行。</font></span></p>
<p style="MARGIN-LEFT: 18pt"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font color="#FFFFFF">⑵局部性原理</font></span></p>
<p style="MARGIN-LEFT: 42pt; TEXT-INDENT: -12pt; mso-list: l9 level1 lfo14; tab-stops: list 42.0pt"><font color="#FFFFFF"><span lang="EN-US" style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">①</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">程序中有些部分是彼此互斥的，不是每次运行时都能执行到；</span></font></p>
<p style="MARGIN-LEFT: 42pt; TEXT-INDENT: -12pt; mso-list: l9 level1 lfo14; tab-stops: list 42.0pt"><font color="#FFFFFF"><span lang="EN-US" style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">②</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">程序执行的时间局部性</span></font></p>
<p style="MARGIN-LEFT: 30pt"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font color="#FFFFFF">③程序执行的空间局部性</font></span></p>
<p style="MARGIN-LEFT: 18pt"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font color="#FFFFFF">⑶虚拟存储器的定义</font></span></p>
<p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l13 level1 lfo13; tab-stops: list 18.0pt"><font color="#FFFFFF"><span lang="EN-US">2．</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">虚拟存储器的实现方式：</span></font></p>
<p><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">
</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">⑴分页请求系统</span></font></p>
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</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">⑵请求分段系统</span></font></p>
<p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l13 level1 lfo13; tab-stops: list 18.0pt"><font color="#FFFFFF"><span lang="EN-US">3．</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">虚拟存储器的特征：</span></font></p>
<p style="MARGIN-LEFT: 18pt"><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US"> </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">离散性、多次性、对换性、虚拟性</span></font></p>
<p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l13 level1 lfo13; tab-stops: list 18.0pt"><font color="#FFFFFF"><span lang="EN-US">4．</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">实现虚拟存储器必须解决的问题：</span></font></p>
<p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l13 level1 lfo13; tab-stops: list 18.0pt"><font color="#FFFFFF"><span lang="EN-US">5．</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">虚拟存储器并非无限大，限制条件有</span></font></p>
<p style="MARGIN-LEFT: 18pt"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font color="#FFFFFF">⑴外部存储器大小</font></span></p>
<p style="MARGIN-LEFT: 18pt"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font color="#FFFFFF">⑵指令中地址场长度的限制</font></span></p>
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