petsc-3.9.4 2018-09-11

KSPSetUseFischerGuess

Use the Paul Fischer algorithm

#include "petscksp.h" 
PetscErrorCode  KSPSetUseFischerGuess(KSP ksp,PetscInt model,PetscInt size)

Logically Collective on KSP

	ksp	- the Krylov context
	model	- use model 1, model 2 or any other number to turn it off
	size	- size of subspace used to generate initial guess

-ksp_fischer_guess <model,size> -uses the Fischer initial guess generator for repeated linear solves

KSP, set, options, prefix, database

advanced