The input to SLO is a zip-file containing the source code of the program and the results of a profiling run. How to create this zip-file is documented in a separate chapter (Chapter 4, Creating .slo.zip files) , as it requires compiling your program with a special GCC-compiler. In this chapter, it is assumed that you already created such a .slo.zip file. Alternatively, you may download some of the example .slo.zip files from the SLO homepage to experiment with before profiling your own application.