Step 2 -- Relaxation Preconditioners

These preconditioners are implemented by the IFPACK library by class Ifpack_PointRelaxation, whose documentation is available here.

Typically, these preconditioners perform poorly as stand-alone, while they are quite effective as smoothers in multilevel preconditioners. If you want to analyze the performances of these preconditioners, first click on Relaxation Preconditioners to visualize the list of parameters, then set Yes to one or more of the following: Jacobi, Gauss-Seidel, symmetric Gauss-Seidel. You have to specify two parameters: the number of sweeps and the damping parameter.