| rtol = relative tolerance, | - . abstol = absolute tolerance.
|
| dtol = divergence tolerance, | - - rnorm_0 is the two norm of the right hand side. When initial guess is non-zero you
can call KSPConvergedDefaultSetUIRNorm() to use the norm of (b - A*(initial guess))
as the starting point for relative norm convergence testing, that is as rnorm_0
|
Use KSPSetTolerances() to alter the defaults for rtol, abstol, dtol.
Use KSPSetNormType() (or -ksp_norm_type <none,preconditioned,unpreconditioned,natural>) to change the norm used for computing rnorm
The precise values of reason are macros such as KSP_CONVERGED_RTOL, which are defined in petscksp.h.
This routine is used by KSP by default so the user generally never needs call it directly.
Use KSPSetConvergenceTest() to provide your own test instead of using this one.
Keywords
KSP, default, convergence, residual
See Also
KSPSetConvergenceTest(), KSPSetTolerances(), KSPConvergedSkip(), KSPConvergedReason, KSPGetConvergedReason(),
KSPConvergedDefaultSetUIRNorm(), KSPConvergedDefaultSetUMIRNorm(), KSPConvergedDefaultCreate(), KSPConvergedDefaultDestroy()
Level:intermediate
Location:src/ksp/ksp/interface/iterativ.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages