At runtime, how can I determine programmatically how much memory is used by dynamically-linked libraries?

Question

I want to find out how much memory my application is using. I also want to know what part of my program is using the most memory. For example, I have a process that uses 100MB of memory, there is a .dll in that process that is using 90MB of memory. I would like to know "what" .dll takes that 90MB.

I want to take this value and use it in my program; I want to make a server where you can view the memory usage of separate parts.

This application is going to run on Windows.

Answer 1

The question is utterly operating system dependent.

(I assume that DLL translates to dynamically loaded libraries and ELF shared objects in the Linux world)

For a Linux application, your application can sequentially read the /proc/self/maps textual pseudo-file.

If you know that your application process id is 1234, you can also read the /proc/1234/maps file, eg by typing in a terminal

 cat /proc/1234/maps

There are also /proc/self/smaps and /proc/1234/smaps which are slightly more detailed.