How to get current CPU and RAM usage in C++?

There is an open source library that gives these (and more system info stuff) across many platforms: SIGAR API.

Sadly these things rely heavily on the underlying OS, so there are no platform-independent calls. (Maybe there are some wrapper frameworks, but I don't know of any.).

Here's a class for memory usage on UNIX machines.

The psutil library will give you some system information (CPU / Memory usage) on a variety of platforms.

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