petsc-3.11.4 2019-09-28
KSPConvergedDefaultSetUMIRNorm
makes the default convergence test use min(|| B*(b - A*(initial guess))||,|| B*b ||) In the case of right preconditioner or if KSPSetNormType(ksp,KSP_NORM_UNPRECONDIITONED) is used there is no B in the above formula. UMIRNorm is short for Use Minimum Initial Residual Norm.
Synopsis
#include "petscksp.h"
PetscErrorCode KSPConvergedDefaultSetUMIRNorm(KSP ksp)
Collective on KSP
Input Parameters
ksp -iterative context
Options Database
-ksp_converged_use_min_initial_residual_norm -
Use KSPSetTolerances() to alter the defaults for rtol, abstol, dtol.
The precise values of reason are macros such as KSP_CONVERGED_RTOL, which
are defined in petscksp.h.
Keywords
KSP, default, convergence, residual
See Also
KSPSetConvergenceTest(), KSPSetTolerances(), KSPConvergedSkip(), KSPConvergedReason, KSPGetConvergedReason(), KSPConvergedDefaultSetUIRNorm()
Level
intermediate
Location
src/ksp/ksp/interface/iterativ.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages