abf.opts

# Approximate Block Factorization (ABF) solver for exSaddle
-saddle_ksp_type fgmres
-fs
-saddle_fieldsplit_u_pc_type mg
-saddle_fieldsplit_u_ksp_type gcr
-saddle_fieldsplit_u_ksp_rtol 1e-2
-saddle_fieldsplit_u_pc_mg_levels 3 # vary
-saddle_fieldsplit_u_mg_levels_pc_type jacobi
-saddle_fieldsplit_u_mg_levels_ksp_type chebyshev
-saddle_fieldsplit_u_mg_levels_ksp_chebyshev_esteig 0,0.2,0,1.1
-saddle_fieldsplit_u_mg_levels_ksp_max_it 8
-saddle_fieldsplit_u_mg_levels_ksp_norm_type none
-saddle_fieldsplit_u_pc_mg_galerkin
-saddle_fieldsplit_p_ksp_type preonly
-saddle_fieldsplit_p_pc_type bjacobi
-saddle_fieldsplit_u_mg_coarse_pc_factor_mat_solver_type umfpack