petsc-3.9.4 2018-09-11
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.
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