内存中的DLL大小大小在硬盘上 [英] DLL size in memory & size on the hard disk

问题描述

内存中的DLL大小和硬盘上的大小之间是否有关系？

Is there a relationship between DLL size in memory and size on the hard disk?

这是因为我正在使用任务管理器扩展（MS），我可以去列表中的EXE，然后右键单击 - > Module，然后我可以看到EXE所使用的所有DLL。它有一个长度列，但是是字节？并且DLL的值（Length）似乎与硬盘上的（DLL）大小不同。为什么？

This is because I am using Task Manager extension (MS), and I can go to an EXE in the list and right click -> Module, then I can see all the DLLs this EXE is using. It has a Length column, but is it in bytes? And the value (Length) of the DLL seems to be different from the (DLL) size on the hard disk. Why?

推荐答案

有一种关系，但并不完全直接或直接。

There's a relationship, but it's not entirely direct or straightforward.

当您的DLL被首次使用时，它被映射到内存。这不会将其加载到内存中，只需在进程中分配一些地址空间，在需要时可以/可以加载它。然后，通过请求分页将DLL的各个页面加载到内存中 - 即，当您引用已分配的一些地址空间时，映射到该地址（或数据）的代码（或数据）将被加载如果它还没有在内存中。

When your DLL is first used, it gets mapped to memory. That doesn't load it into memory, just allocates some address space in your process where it can/could be loaded when/if needed. Then, individual pages of the DLL get loaded into memory via demand paging -- i.e., when you refer to some of the address space that got allocated, the code (or data) that's mapped to that/those address(es) will be loaded if it's not already in memory.

现在，地址映射占用了一点空间（每个兆字节地址空间映射的4K页）。当然，当您将一些数据加载到内存中时，也会占用内存。

Now, the address mapping does take up a little space (one 4K page for each megabyte of address space that gets mapped). Of course, when you load some data into memory, that uses up memory too.

但是，请注意，大多数页面可以/也将在进程之间共享，因此如果您的DLL由5个不同的进程一次使用，它将被映射5次（即，一次使用它的每个进程），但内存中仍然只有一个物理副本（至少通常）。

Note, however, that most pages can/will be shared between processes too, so if your DLL was used by 5 different processes at once, it would be mapped 5 times (i.e., once to each process that used it) but there would still only be one physical copy in memory (at least normally).

在这些之间，一个特定的DLL的内存消耗正是你的意思，甚至有点困难。

Between those, it can be a little difficult to even pin down exactly what you mean by the memory consumption of a particular DLL.

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