Please refer to the detailed documentation for constructing roofline models at tinyurl.com/CS6235roofline.
It has instructions to obtain the roofline ceilings (using ERT), the application characteristics (using nvprof), and running plotting scripts to visualize roofline models.
Please contact me at maheshl@cs.utah.edu if you have any issues in running ERT and the plotting scripts, and using nvprof for performance analysis, or if you have any feedback to improve the documentation and the code.