petsc-3.10.2 2018-10-09
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KSPMonitorDynamicTolerance

Recompute the inner tolerance in every outer iteration in an adaptive way.

Synopsis

#include "petscksp.h" 
PetscErrorCode KSPMonitorDynamicTolerance(KSP ksp,PetscInt its,PetscReal fnorm,void *dummy)
Collective on KSP

Input Parameters

Notes

This may be useful for a flexibly preconditioner Krylov method to control the accuracy of the inner solves needed to gaurantee the convergence of the outer iterations.

Keywords

KSP, inner tolerance

See Also

KSPMonitorDynamicToleranceDestroy()

Level

advanced

Location

src/ksp/ksp/interface/iterativ.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages
ksp - iterative context
n - iteration number (not used)
fnorm - the current residual norm
dummy - some context as a C struct. fields: coef: a scaling coefficient. default 1.0. can be passed through -sub_ksp_dynamic_tolerance_param bnrm: norm of the right-hand side. store it to avoid repeated calculation