| -snes_ngs_sweeps | - Number of sweeps of GS to apply | |
| -snes_ngs_atol | - Absolute residual tolerance for GS iteration | |
| -snes_ngs_rtol | - Relative residual tolerance for GS iteration | |
| -snes_ngs_stol | - Absolute update tolerance for GS iteration | |
| -snes_ngs_max_it | - Maximum number of sweeps of GS to apply | |
| -snes_ngs_secant | - Use pointwise secant local Jacobian approximation with coloring instead of user provided Gauss-Seidel routine, this is used by default if no user provided Gauss-Seidel routine is available. Requires either that a DM that can compute a coloring is available or a Jacobian sparse matrix is provided (from which to get the coloring). | |
| -snes_ngs_secant_h | - Differencing parameter for secant approximation | |
| -snes_ngs_secant_mat_coloring | - Use the graph coloring of the Jacobian for the secant GS even if a DM is available. |