| -snes_type <type> | - newtonls, newtontr, ngmres, ncg, nrichardson, qn, vi, fas, SNESType for complete list
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| -snes_stol | - convergence tolerance in terms of the norm
of the change in the solution between steps
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| -snes_atol <abstol> | - absolute tolerance of residual norm
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| -snes_rtol <rtol> | - relative decrease in tolerance norm from initial
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| -snes_divergence_tolerance <divtol> | - if the residual goes above divtol*rnorm0, exit with divergence
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| -snes_force_iteration <force> | - force SNESSolve() to take at least one iteration
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| -snes_max_it <max_it> | - maximum number of iterations
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| -snes_max_funcs <max_funcs> | - maximum number of function evaluations
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| -snes_max_fail <max_fail> | - maximum number of line search failures allowed before stopping, default is none
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| -snes_max_linear_solve_fail | - number of linear solver failures before SNESSolve() stops
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| -snes_lag_preconditioner <lag> | - how often preconditioner is rebuilt (use -1 to never rebuild)
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| -snes_lag_jacobian <lag> | - how often Jacobian is rebuilt (use -1 to never rebuild)
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| -snes_trtol <trtol> | - trust region tolerance
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| -snes_no_convergence_test | - skip convergence test in nonlinear
solver; hence iterations will continue until max_it
or some other criterion is reached. Saves expense
of convergence test
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| -snes_monitor [ascii][:filename][:viewer format] | - prints residual norm at each iteration. if no filename given prints to stdout
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| -snes_monitor_solution [ascii binary draw][:filename][:viewer format] | - plots solution at each iteration
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| -snes_monitor_residual [ascii binary draw][:filename][:viewer format] | - plots residual (not its norm) at each iteration
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| -snes_monitor_solution_update [ascii binary draw][:filename][:viewer format] | - plots update to solution at each iteration
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| -snes_monitor_lg_residualnorm | - plots residual norm at each iteration
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| -snes_monitor_lg_range | - plots residual norm at each iteration
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| -snes_fd | - use finite differences to compute Jacobian; very slow, only for testing
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| -snes_fd_color | - use finite differences with coloring to compute Jacobian
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| -snes_mf_ksp_monitor | - if using matrix-free multiply then print h at each KSP iteration
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| -snes_converged_reason | - print the reason for convergence/divergence after each solve
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| -npc_snes_type <type> | - the SNES type to use as a nonlinear preconditioner
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