petsc-master 2017-01-17
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makes the default convergence test use || B*(b - A*(initial guess))|| instead of || 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. UIRNorm is short for Use Initial Residual Norm.


#include "petscksp.h" 
PetscErrorCode  KSPConvergedDefaultSetUIRNorm(KSP ksp)
Collective on KSP

Input Parameters

ksp -iterative context

Options Database

-ksp_converged_use_initial_residual_norm - Notes: 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.

If the convergence test is not KSPConvergedDefault() then this is ignored.

If right preconditioning is being used then B does not appear in the above formula.


KSP, default, convergence, residual

See Also

KSPSetConvergenceTest(), KSPSetTolerances(), KSPConvergedSkip(), KSPConvergedReason, KSPGetConvergedReason(), KSPConvergedDefaultSetUMIRNorm()

Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages