petsc-master 2019-11-16
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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

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

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.

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