SNESConvergedDefault

Default convergence test for SNESSolve().

Synopsis

#include "petsc/private/snesimpl.h"   
PetscErrorCode SNESConvergedDefault(SNES snes, PetscInt it, PetscReal xnorm, PetscReal snorm, PetscReal fnorm, SNESConvergedReason *reason, void *dummy)

Collective

Input Parameters

• snes - the SNES context

• it - the iteration (0 indicates before any Newton steps)

• xnorm - 2-norm of current iterate

• snorm - 2-norm of current step

• fnorm - 2-norm of function at current iterate

• dummy - unused context

Output Parameter

• reason - converged reason, see SNESConvergedReason

Options Database Keys

• -snes_convergence_test default - see SNESSetFromOptions()

• -snes_stol - convergence tolerance in terms of the norm of the change in the solution between steps

• -snes_atol - absolute tolerance of residual norm

• -snes_rtol - relative decrease in tolerance norm from the initial 2-norm of the solution

• -snes_divergence_tolerance - if the residual goes above divtol*rnorm0, exit with divergence

• -snes_max_funcs <max_funcs> - maximum number of function evaluations

• -snes_max_fail <max_fail> - maximum number of line search failures allowed before stopping, default is none

• -snes_max_linear_solve_fail - number of linear solver failures before SNESSolve() stops

Notes

This routine is not generally called directly. It is set with SNESSetConvergenceTest() automatically before the SNESSolve().

It can be called within a custom convergence test that should also apply the standard convergence tests

See Also

SNES: Nonlinear Solvers, SNES, SNESSolve(), SNESSetConvergenceTest(), SNESConvergedSkip(), SNESSetTolerances(), SNESSetDivergenceTolerance(), SNESConvergedReason

Level

developer

Location

src/snes/interface/snesut.c

Examples

src/snes/tutorials/ex30.c
src/snes/tutorials/ex69.c

Implementations

SNESConvergedDefault_VI() in src/snes/impls/vi/vi.c

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