---- Minimum Surface Area Problem ----- mx: 10 my: 10 iter = 0, Function value 1.46076, Residual: 0.207785 iter = 1, Function value 1.41871, Residual: 0.0223274 iter = 2, Function value 1.41847, Residual: 0.000373636 iter = 3, Function value 1.41847, Residual: < 1.0e-6 Tao Object: 2 MPI processes type: snes SNES Object: 2 MPI processes type: newtonls maximum iterations=50, maximum function evaluations=10000 tolerances: relative=1e-08, absolute=0.0001, solution=1e-08 total number of linear solver iterations=35 total number of function evaluations=4 norm schedule ALWAYS SNESLineSearch Object: 2 MPI processes type: bt interpolation: cubic alpha=1.000000e-04 maxlambda=1.000000e+00, minlambda=1.000000e-12 tolerances: relative=1.000000e-08, absolute=1.000000e-15, lambda=1.000000e-08 maximum iterations=40 KSP Object: 2 MPI processes type: gmres restart=30, using classical (unmodified) Gram-Schmidt orthogonalization with no iterative refinement happy breakdown tolerance=1e-30 maximum iterations=15, initial guess is zero tolerances: relative=1e-05, absolute=1e-50, divergence=10000. left preconditioning using PRECONDITIONED norm type for convergence test PC Object: 2 MPI processes type: bjacobi number of blocks = 2 Local solver information for first block is in the following KSP and PC objects on rank 0: Use -ksp_view ::ascii_info_detail to display information for all blocks KSP Object: (sub_) 1 MPI process type: preonly maximum iterations=10000, initial guess is zero tolerances: relative=1e-05, absolute=1e-50, divergence=10000. left preconditioning not checking for convergence PC Object: (sub_) 1 MPI process type: ilu out-of-place factorization 0 levels of fill tolerance for zero pivot 2.22045e-14 matrix ordering: natural factor fill ratio given 1., needed 1. Factored matrix: Mat Object: (sub_) 1 MPI process type: seqaij rows=50, cols=50 package used to perform factorization: petsc total: nonzeros=364, allocated nonzeros=364 not using I-node routines linear system matrix, which is also used to construct the preconditioner: Mat Object: (sub_) 1 MPI process type: seqaij rows=50, cols=50 total: nonzeros=364, allocated nonzeros=364 total number of mallocs used during MatSetValues calls=0 not using I-node routines linear system matrix, which is also used to construct the preconditioner: Mat Object: 2 MPI processes type: mpiaij rows=100, cols=100 total: nonzeros=784, allocated nonzeros=784 total number of mallocs used during MatSetValues calls=0 convergence tolerances: gatol=1e-08, grtol=1e-05, steptol=0., gttol=0. Residual in Function/Gradient:=9.23151e-08 Objective value=1.41847 total number of iterations=3, (max: 10000) total number of function evaluations=10, (max: unlimited) total number of function/gradient evaluations=4, (max: unlimited) total number of Hessian evaluations=3 Solution converged: User Terminated