Shiny is a lightning fast, fully documented & by-far-easiest-to-use C/C++/Lua profiler with no extensive surgery. Results are smoothed & shown in run-time as a call-tree or sorted-by-time. Output also renderable as graphs in Ogre3D or your custom engine
At one point, Open Hub analyzed source code for this project based on code location(s) available at that time. Since then, the code locations have been removed.