petsc-3.5.4 2015-05-23
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