KSPSingularValueMonitor

Prints the two norm of the true residual and estimation of the extreme singular values of the preconditioned problem at each iteration.

Synopsis

int KSPSingularValueMonitor(KSP ksp,int n,double rnorm,void *dummy)
Collective on KSP

Input Parameters

ksp - the iterative context
n - the iteration
rnorm - the two norm of the residual

Options Database Key

-ksp_singmonitor -Activates KSPSingularValueMonitor()

Notes

The CG solver uses the Lanczos technique for eigenvalue computation, while GMRES uses the Arnoldi technique; other iterative methods donot currently compute singular values.

Keywords

KSP, CG, default, monitor, extreme, singular values, Lanczos, Arnoldi

See Also

KSPComputeExtremeSingularValues()

Location: src/ksp/interface/iterativ.c
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