32位程序在64位OS上运行时相对于在32位OS中本机运行时相对慢吗？ [英] Do 32 bit programs run relatively slower on 64 bit OS against when they are natively run in 32 bit OS?

问题描述

我在这里阅读有关WOW 64的信息
http://en.wikipedia.org/wiki / WOW64

I was reading about WOW 64 here http://en.wikipedia.org/wiki/WOW64

，并了解到它在64位Windows操作系统中可以运行32位程序。

and learnt that its a layer in 64 bit Windows OS to run 32 bit programs.

所以我可以假设32位程序在64位OS上运行相对较慢，而在32位OS中本机运行。

So can I assume that 32 bit programs run relatively slower on 64 bit OS against when they are natively run in 32 bit OS.

我可以看到在64位操作系统中，内存访问量超过4 GB。但是，这种优势是否一定抵消了WOW64层增加的少量开销？ 64位系统是否还有其他优势可以弥补这一点。

I can see the advantages of memory access of over 4 GB in 64 bit OS. But does this advantage necessarily offset the small overhead added by layer of WOW64 ? Are there any other advantages of 64 bit which offset this.

推荐答案

64位系统的主要优势在于它允许64位模式下的应用程序，反过来，如果您需要访问超过4GB的内存，则主要有用。如果有此要求，则使用64位系统是唯一的选择。您的应用程序将使用64位代码，因此不会使用WOW64，因此不会引起问题。

The main advantage of a 64-bit system is that it allows applications in 64-bit mode, which, in turn, is primarily useful if you need to access more than 4GB memory. If you have that requirement, using a 64-bit system is your only choice. Your application would be using 64-bit code, so WOW64 would not be used, and thus not cause problems.

如果您实际上并不需要使用更多代码，单个进程中的内存要比4GB更大，因此64位Windows是否真的是一个改进值得商bat。如果要使用4GB以上的主内存，则可能需要64位Windows（尽管您也可以使用PAE，这有其自身的缺点）。尽管如此，在64位系统上，您仍可以运行64位应用程序。使用AMD64处理器，因为处理器具有更多的寄存器，所以64位模式可能比本机32位模式更快。这种轻微的收益是否大于轻微的损失。 WOW64取决于您的应用程序组合。

If you don't really have the requirement to use more than 4GB of memory in a single process, it becomes debatable whether 64-bit Windows is really an improvement. You might need 64-bit Windows if you want to use more than 4GB of main memory at all (although you can also use PAE for that, which has its own disadvantages). Still, on a 64-bit system, you can run 64-bit applications. With AMD64 processors, 64-bit mode might be faster than native 32-bit mode, because the processor has more registers. Whether this slight gain outweighs the slight loss wrt. WOW64 depends on your application mix.

我个人认为，很多人安装64位Windows，是因为他们不完全了解这样做的后果，但感觉到出于安全考虑（由于缺少驾驶员，他们可能不会这样做）。

Personally, I think many people install 64-bit Windows because they don't fully understand the consequences of doing so, but feel they are on the safe side (which they may not, due to the lack of drivers).

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