The MueLu scaling test "MueLu_Driver.exe" accepts a variety of command line options.
The most useful are:

  --help                                   prints all options and their default values

  --matrixType               string        matrix type to generate: Laplace1D, Laplace2D, Laplace3D, Elasticity2D, Elasticity3D
                                           (default: --matrixType="Laplace2D")
  --matrix                   string        MatrixMarket file containing matrix
                                           (default: --matrix="")
  --rhs                      string        MatrixMarket file containing right hand side
                                           (default: --rhs="")
  --nx                       long long int mesh points in x-direction.
                                           (default: --nx=100)
  --node                     string        node type (serial | openmp | cuda)
                                           (default: --node="")
  --ny                       long long int mesh points in y-direction.
                                           (default: --ny=100)
  --nz                       long long int mesh points in z-direction.
                                           (default: --nz=100)
  --its                      int           maximum number of solver iterations
                                           (default: --its=200)
  --solver                   string        Krylov solver type: (none | cg | gmres | standalone)
                                           (default: --solver="cg")
  --xml                      string        read MueLu parameters from a file
                                           (default: --xml="scaling.xml")
  --timings                  bool          print timings to screen
  --notimings                              (default: --timings)
