方法封装的性能开销 [英] Performance cost of Method Encapsulation

问题描述

有一个性能代价封装方法呢？一个非常简单的，武断的例子：

Is there a performance cost to encapsulating methods? A very brief, arbitrary example:

        public static decimal Floor(decimal value)
        {
            return Math.Floor(value);
        }

请问上面的函数被内联？如果是的话，那会是完全相同的从代码中调用Math.Floor（）？我写这之前做了谷歌。

Would the above function be inlined? And if so, would it be the exact same as calling Math.Floor() from the code? I did Google before writing this.

推荐答案

方法可能会被内联（在JIT时，C＃编译器的不联方法）。即使没有成本应该不会影响你的整体方案。由于优化和性能数据是针对特定的代码/应用程序，您需要，如果你看到性能问题来衡量你的情况

Method likely will be inlined (at JIT time, C# compiler does not inline method in IL). Even if not cost is unlikely to impact your overall program. Since optimization and performance numbers are specific to particular code/application you need to measure your case if you see performance problem.

在特定的编写更快的托管代码：知道什么MSDN上的东西成本的文章给出了如下估算方法调用的成本：最大6.8纳秒的（2003级机）如果呼叫未优化。

In particular Writing Faster Managed Code: Know What Things Cost article on MSDN gives following estimate for cost of method call: max 6.8 nano-seconds (for 2003 level machine) if the call is not optimized.

考虑阅读文章的其余部分。尤其是表的不仅是方法调用的成本，又能有多少3的会谈做运营的微不足道加法，减法，乘法和除法的成本。的

Consider reading the rest of the article. In particular Table 3 talks about not only the cost of method calls, but also how much do the operations as trivial as addition, subtraction, multiplication and division cost.

如果您需要确认方法是否被内联 - 它是覆盖在很多所以喜欢的我看看C＃编译器内联方法调用？

If you need to confirm whether method is inlined - it is covered in many SO questions like Can I check if the C# compiler inlined a method call?

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