config_name: test
petsc_options:
    # - u_ten_ksp_view
    # - u_ten_ksp_converged_reason
    # - u_ten_ksp_monitor_true_residual
    - u_ten_ksp_type preonly
    # - u_ten_ksp_rtol 1.0e-6
    # - u_ten_ksp_initial_guess_nonzero

    # - u_ten_pc_type jacobi

     # - u_ten_pc_side right
    - u_ten_pc_type lu
    # - u_ten_pc_gamg_type agg
    # - u_ten_pc_gamg_threshold 0.03
    # - u_ten_pc_gamg_square_graph 10     # no effect ??
    # - u_ten_pc_gamg_sym_graph
    # - u_ten_mg_levels_ksp_type richardson
    # - u_ten_mg_levels_pc_type sor
    # # - u_ten_pc_gamg_coarse_eq_limit 50    # ignored !?!?!


    # - p_ksp_view
    - p_ksp_converged_reason
    - p_ksp_monitor_true_residual
    # - p_ksp_type gmres
    # - p_ksp_norm_type unpreconditioned
    - p_ksp_type fgmres
    - p_ksp_rtol 1.0e-8
    - p_ksp_initial_guess_nonzero
    - p_pc_type gamg
    - p_pc_gamg_type agg
    - p_pc_gamg_threshold 0.03
    - p_pc_gamg_square_graph 10     # no effect ??
    - p_pc_gamg_sym_graph
    - p_mg_levels_ksp_type richardson
    - p_mg_levels_pc_type sor


    - p_mass_ksp_type preonly
    # - p_mass_ksp_rtol 1.0e-8
    # - p_mass_ksp_initial_guess_nonzero
    - p_mass_pc_type lu

    # - p_pc_type hypre
    # - p_pc_hypre_type boomeramg
    # - p_pc_hypre_boomeramg_strong_threshold 0.75
    # - p_pc_hypre_boomeramg_max_levels 25
    # - p_pc_hypre_boomeramg_smooth_type Euclid
    # - p_pc_hypre_boomeramg_eu_bj

    # - p_ksp_type preonly
    # - p_pc_type lu
    # - p_pc_factor_mat_solver_package mumps
    # - p_mat_mumps_icntl_14 80

    # - p_ksp_type cg
    # - p_ksp_converged_reason
    # - p_ksp_monitor_true_residual
    # - p_ksp_rtol 1.0e-8

    # - p_pc_type hypre
    # - p_pc_hypre_type boomeramg
    # - p_pc_hypre_boomeramg_agg_nl 4
    # - p_pc_hypre_boomeramg_agg_num_paths 2
    # # Truncation factor for interpolation (note: increasing towrds 1
    # # appears to reduce memory useage
    # - p_pc_hypre_boomeramg_truncfactor 0.9
    # # Max elements per row for interpolation operator
    # - p_pc_hypre_boomeramg_P_max 5
    # # - p_pc_hypre_boomeramg_max_levels 10
    # # Strong threshold (BoomerAMG docs recommend 0.5-0.6 for 3D
    # #   Poisson
    # - p_pc_hypre_boomeramg_strong_threshold 0.5
    
    # - u_upd_ksp_converged_reason
    # - u_upd_ksp_monitor_true_residual
    # - u_upd_ksp_view
    - u_upd_ksp_type preonly
    # - u_upd_ksp_rtol 1.0e-8
    # - u_upd_ksp_initial_guess_nonzero
    - u_upd_pc_type lu