📄 c++ builder 程序设计实用教程 - 9_3_1 进程的概念 - 张晋 - 17xie.htm
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style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">与用户交互的进程优先级高可以使得应用程序及时的响应用户的输入。</SPAN></FONT></P>
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style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">多进程虽然在控制上比较复杂，但是它有下面明显的优点：</SPAN></P>
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style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">避免瓶颈</SPAN></P>
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style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">使用单进程，应用程序在等待一个缓慢操作完成的过程中，必须停止其他所有的工作，这样导致</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">CPU</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">直到操作完成才真正进入空闲状态。而使用多进程，应用程序可以在一个现成进入等待的过程中，转而去执行其他的进程，避免了瓶颈。</SPAN></P>
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style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">并行操作</SPAN></P>
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style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">应用程序的行为一般可以分为一些可以独立的、并行的操作，使用多进程可以让这些操作并行执行。此外，还可为不同的任务指定不同的优先级，以便使</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">CPU</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有更多的时间去执行更为紧迫的任务。</SPAN></P>
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style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">提高效率</SPAN></P>
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style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如果运行应用程序的系统有多个处理器，可以将应用程序的任务分配到不同的处理器中，并让它们在不同的处理器上同步运行以提高系统的性能。</SPAN></P>
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