📄 csdn_文档中心_关注内存 提高软件性能(3).htm
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<TD><B> 关注内存
提高软件性能(3)</B> loyalzu（原作） </TD></TR>
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<TD align=middle bgColor=#003399><FONT color=#ffffff>关键字</FONT></TD>
<TD width=500> 内存,内存使用 ,win32 heap</TD></TR>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">二</SPAN><SPAN
lang=EN-US>.</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如何提高内存的使用效率</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我所见过的主要有以下</SPAN><SPAN
lang=EN-US>2</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">种</SPAN><SPAN
lang=EN-US>:</SPAN></FONT></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-ALIGN: left; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US style="mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore"><FONT size=3>1.</FONT><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><FONT size=3><SPAN lang=EN-US>stl</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">里面的</SPAN><SPAN
lang=EN-US>2</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">级配置器的设计</SPAN><SPAN
lang=EN-US>.</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我曾按照</SPAN><SPAN
lang=EN-US> stl</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">里面的思路自己实现了一个简单的</SPAN><SPAN
lang=EN-US>vector,</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">效率和</SPAN><SPAN
lang=EN-US>stl</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN
lang=EN-US>vector</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">没法比</SPAN><SPAN
lang=EN-US>.</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">差远了</SPAN><SPAN
lang=EN-US>;).stl</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在内存分配</SPAN><SPAN
lang=EN-US>(alloc)</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这块下了很大的功夫</SPAN><SPAN
lang=EN-US>(</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当然不只是内存使用</SPAN><SPAN
lang=EN-US>).</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">极大改善了效率</SPAN><SPAN
lang=EN-US>.</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">呵呵</SPAN><SPAN
lang=EN-US>,</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">想看更多细节就去翻候捷老师的</SPAN><SPAN
lang=EN-US><< stl</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">源码解析</SPAN><SPAN
lang=EN-US>>></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第</SPAN><SPAN
lang=EN-US>2</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">章吧</SPAN></FONT></P>
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lang=EN-US style="mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore"><FONT size=3>2.</FONT><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><FONT size=3><SPAN lang=EN-US>SLAB</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">算法</SPAN><SPAN
lang=EN-US>,(</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以下是我收集的一些资料</SPAN><SPAN
lang=EN-US>)</SPAN></FONT></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-ALIGN: left; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US style="mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore"><FONT size=3>3.</FONT><SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><FONT size=3><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下面是对</SPAN><SPAN
lang=EN-US>slab</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">算法的描述</SPAN><SPAN
lang=EN-US>:</SPAN></FONT></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-ALIGN: left; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">4.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="COLOR: blue; FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分配对象：</SPAN><SPAN
lang=EN-US style="COLOR: blue; FONT-SIZE: 9pt"><BR>if(</SPAN><SPAN
style="COLOR: blue; FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在对象对应的缓存区中还有空闲的对象位置</SPAN><SPAN
lang=EN-US style="COLOR: blue; FONT-SIZE: 9pt">){<?xml:namespace
prefix = o ns = "urn:schemas-microsoft-com:office:office"
/><o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-ALIGN: left; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">5.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="COLOR: blue; FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">获得此对象，不必再作初始化</SPAN><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt">}<o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-ALIGN: left; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">6.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt">else{<o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-ALIGN: left; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">7.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 2">
</SPAN></SPAN><SPAN
style="COLOR: blue; FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分配内存</SPAN><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt"><o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-ALIGN: left; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">8.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 2">
</SPAN></SPAN><SPAN
style="COLOR: blue; FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">初始化对象</SPAN><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt">}<o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-ALIGN: left; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">9.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="COLOR: blue; FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">释放对象：只需在缓存中将相应位置标为空闲，而不需要再作析构。</SPAN><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt"><o:p></o:p></SPAN></P>
<P align=left class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-ALIGN: left; TEXT-INDENT: -18pt; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">10.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="COLOR: blue; FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">若系统资源不足：从缓存中取得一些未使用的对象空间，对这些对象作析构，将这些对象所占的空间释放给系统</SPAN><SPAN
lang=EN-US
style="COLOR: blue; FONT-SIZE: 9pt"><o:p></o:p></SPAN></P>
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style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left"><SPAN
lang=EN-US><o:p><FONT size=3> </FONT></o:p></SPAN></P>
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style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left"><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes"><FONT size=3>
</FONT></SPAN></SPAN></P>
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style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-ALIGN: left"><FONT
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