通过Visual Studio性能分析，应用程序运行更快 [英] Application runs faster with visual studio performance analysis

问题描述

我正在调查完成一项特定操作需要花费多少时间.操作如下:

I am investigating for how many time it takes for a particular operation to complete. The operation is like the following:

Parallel.ForEach(items, item => SaveScheme(item));

SaveScheme方法适用于数据库:执行一些查询并处理信息. items集合中的元素数量可能足够大.

The SaveScheme method works with a database: executes some queries and works with the information. The amount of elements in items collection can be big enough.

当我运行此操作时，大约需要20-40秒才能完成.但是，当我在启用概要分析的情况下运行它时，仅需3秒钟！

When I run this operation, it takes about 20-40 seconds to complete. But when I run it with a profiling turned on, it takes only 3 seconds!

我没有找到有关此问题的任何信息.我唯一的猜测是，配置Parallel.ForEach会比没有配置创建更多的线程，但是我不确定，即使是真的，我也不知道该怎么做.

I didn't find any information about this problem. My only guess is that with profiling Parallel.ForEach creates more threads than without it, but I don't know for sure, and even if it's true, I don't know what to do with it.

那么，为什么会发生这种情况?在不进行概要分析的情况下运行应用程序时如何归档这种性能?

So, why is that happens and how can I archieve this performance when I run the application without profiling?

UPD. Parallel与此无关:我使用简单的foreach进行了测试，并且操作仍在3秒内完成！

UPD. Parallel has nothing to do with this: I tested with simple foreach instead and the operation still completes in 3 seconds!

推荐答案

我找到了答案:

原因是因为当您在Visual中运行应用程序时 Studio，调试器已连接到它.当您使用 分析器，调试器未附加.

The reason is because when you run your application within Visual Studio, the debugger is attached to it. When you run it using the profiler, the debugger is not attached.

如果尝试单独运行.exe或通过以下方式运行程序 使用"Debug> Start Without Debugging"(或仅按Ctrl + F5)打开IDE 该应用程序应与分析器一样快地运行.

If you try running the .exe by itself, or running the program through the IDE with "Debug > Start Without Debugging" (or just press Ctrl+F5) the application should run as fast as it does with the profiler.

https://stackoverflow.com/a/6629040/1563172

我没有早点找到它，因为我认为原因是并发的.

I didn't find it earlier because I thought that the reason is concurrency.

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