| -snes_mf | - Activates default matrix-free Jacobian-vector products,
and no preconditioning matrix
|
| -snes_mf_operator | - Activates default matrix-free Jacobian-vector
products, and a user-provided preconditioning matrix
as set by SNESSetJacobian()
|
| -snes_fd | - Uses (slow!) finite differences to compute Jacobian
|