The default behaviour of FitBenchmarking can be changed by supplying an options file. The default values of these options, and how to override them, are given in the pages below.
fitting_option minimizer_option jacobian_option hessian_option output_option logging_option
The options file must be a .ini formatted file (see here). Some example files can be found in the examples folder of the source, which is also available to download at BenchmarkProblems.