Windows下多线程程序如何获得多核的好处？有什么原则？(内有具体问题)

two_ears 2008-05-04 10:14:23

我原有的程序只是利用一个子线程，使用户操作界面可以持续响应。
但是考虑在单核CPU上运行仍会影响子线程的运算效率，所以在一个双核机器上运行了一下。
可是丝毫没有看到效果，反而好像慢了不少。（子线程的处理过程中有文件读写）
对此感到非常不理解，请专家帮忙分析一下？

另外，我想把子线程的处理分块，分成多个线程同步进行，想问一下都有什么需要注意的原则，比如粒度？
不知道intel提供的多线程库起到什么作用？我知道有一个开源的TBB，是吗？

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tjgao 2010-04-21

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顶二楼个FEI啊，看个回答都要回复。

two_ears 2008-05-08

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谢了啊:>

Intel_CG 2008-05-07

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应该不会变慢，最多无加速。

two_ears 2008-05-05

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只答一问呀，太扣了吧
呵呵

two_ears 2008-05-04

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嗯，谢谢您的回答，TBB我已经下载了。
看来运用多核还要多学多尝试，呵呵。

想再多问一句，会不会有什么不良的设计，造成在多核机器上运行反而慢？

Intel_CG 2008-05-04

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优化不是一个简单，单向的工作。减少粒度，会减少线程相互等待的时间，但会增加创建critical session的开销，对每个应用都需反复调试。

如果你不想花时间在调试上，TBB将是一个明智的选择，它帮你分配工作，调度线程，增加数据访问并发度。

two_ears 2008-05-04

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哦，忘了，我们用的系统都是Windows XP。
对intel多核支持的怎么样？

Windows Via C／C++,Fifth Edition .pdf

Windows内核设计思想完整版.pdf

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