#
# GMRES+ILU(k):
#-ksp_monitor
#-ksp_rtol 1.e-12
#-ksp_type gmres
#-ksp_gmres_restart 1000
#-pc_type none
#-pc_type ilu
#-pc_factor_levels 60
#
# Direct solver
-ksp_type preonly
-pc_type lu
-pc_factor_mat_solver_package superlu
-mat_superlu_iterrefine extra
-mat_superlu_conditionnumber true
-mat_superlu_printstat true
-mat_superlu_symmetricmode true
-pc_lu_mat_ordering_type rcm # natural, nd, 1wd, rcm, qmd 
-petsc_prealloc 120

# parameters for Yousef's ZITSOL solver
#-zitsol
#-zitsol_precond  2      # preconditioner type (1=ILUT, 2=ARMS)
#-zitsol_lfil     30     # fill-in
#-zitsol_im       100    # Krylov subspace size
#-zitsol_maxits   200    # maximum number of iterations
#-zitsol_tol0     0.01   # threshold (ILUT) or dropping (ARMS) tolerance
#-zitsol_tol      1.e-10 # tolerance