如何衡量 .NET 中的代码性能? [英] How to measure code performance in .NET?

问题描述

我正在使用 DateTime 对一行 C# 代码进行真正快速和肮脏的基准测试:

long lStart = DateTime.Now.Ticks;//做点什么long lFinish = DateTime.Now.Ticks;

问题出在结果上:

<前>开始时间 [633679466564559902]完成时间 [633679466564559902]开始时间 [633679466564569917]完成时间 [633679466564569917]开始时间 [633679466564579932]完成时间 [633679466564579932]

...等等.

鉴于开始时间和结束时间相同，Ticks 显然不够细化.

那么，我如何才能更好地衡量绩效?

解决方案

Stopwatch 类从 .NET 2.0 开始可用，是实现此目的的最佳方式.这是一个非常高性能的计数器，精确到几分之一毫秒.看一看 MSDN 文档，这很漂亮清楚.

正如之前所建议的，为了获得合理的平均时间，还建议多次运行您的代码.

I'm doing some real quick and dirty benchmarking on a single line of C# code using DateTime:

long lStart = DateTime.Now.Ticks;
// do something
long lFinish = DateTime.Now.Ticks;

The problem is in the results:

Start Time [633679466564559902]
Finish Time [633679466564559902]

Start Time [633679466564569917]
Finish Time [633679466564569917]

Start Time [633679466564579932]
Finish Time [633679466564579932]

...and so on.

Given that the start and finish times are identical, Ticks is obviously not granular enough.

So, how can I better measure performance?

解决方案

The Stopwatch class, available since .NET 2.0, is the best way to go for this. It is a very high performance counter accurate to fractions of a millisecond. Take a look at the MSDN documentation, which is pretty clear.

EDIT: As previously suggested, it is also advisable to run your code a number of times in order to get a reasonable average time.

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