难道密封类提供真正的性能优势？ [英] Do sealed classes really offer performance Benefits?

问题描述

我也接触过很多的优化技巧，这也就是说，作为密封，以获得额外的性能优势，您应该标记你的类。

I have come across a lot of optimization tips which say that you should mark your classes as sealed to get extra performance benefits.

我进行了一些测试，以检查性能差和没有发现。难道我做错了什么？我缺少的情况下，密封类会给出更好的结果？

I ran some tests to check the performance differential and found none. Am I doing something wrong? Am I missing the case where sealed classes will give better results?

有没有人进行测试，看到有区别吗？

Has anyone run tests and seen a difference?

帮助我学习:)

推荐答案

抖动有时会使用密封类非虚拟调用方法，因为没有办法，他们可以进一步扩大。

The JITter will sometimes use non-virtual calls to methods in sealed classes since there is no way they can be extended further.

有关于呼叫类型，虚拟/非虚复杂的规则，我不知道他们所有的，所以我真的不能勾勒出他们为你，但是如果你谷歌的密封类和虚拟方法，你可能在找一些文章主题。

There are complex rules regarding calling type, virtual/nonvirtual, and I don't know them all so I can't really outline them for you, but if you google for sealed classes and virtual methods you might find some articles on the topic.

请注意，任何一种性能优势，你会从优化这个层面得到应被视为最后手段，总是在算法级优化您优化的code级之前。

Note that any kind of performance benefit you would obtain from this level of optimization should be regarded as last-resort, always optimize on the algorithmic level before you optimize on the code-level.

这里有一个链接提到这一点：<一href="http://$c$cbetter.com/blogs/patricksmacchia/archive/2008/01/05/rambling-on-the-sealed-keyword.aspx">Rambling在密封的关键字

Here's one link mentioning this: Rambling on the sealed keyword

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