Notes: x^{n+1} = x^{n} + scale*B(b - A x^{n})

Here B is the application of the preconditioner

This method often (usually) will not converge unless scale is very small.

Notes: For some preconditioners, currently SOR, the convergence test is skipped to improve speed, thus it always iterates the maximum number of iterations you've selected. When -ksp_monitor (or any other monitor) is turned on, the norm is computed at each iteration and so the convergence test is run unless you specifically call KSPSetNormType(ksp,KSP_NORM_NONE);

For some preconditioners, currently PCMG and PCHYPRE with BoomerAMG if -ksp_monitor (and also any other monitor) is not turned on then the convergence test is done by the preconditioner itself and so the solver may run more or fewer iterations then if -ksp_monitor is selected.

Supports only left preconditioning

KSPRichardsonSetScale()

Index of all KSP routines

Table of Contents for all manual pages

Index of all manual pages