It's not clear wether you mean total usage for your system, or just for your own application?
Either way, on windows you can get the information using for individual processes using Win32::Process::Info or for the system as a whole using Win32::API.
See google search for some code for both.
You would obviously have to conditionally combine these with a *nix solution by testing $^O. I unaware of a cross-platform solution for this.
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