KSPSetReusePreconditioner#

reuse the current preconditioner for future KSPSolve(), do not construct a new preconditioner even if the Mat operator in the KSP has different values

Synopsis#

#include "petscksp.h" 
#include "petscmat.h" 
PetscErrorCode KSPSetReusePreconditioner(KSP ksp, PetscBool flag)

Collective

Input Parameters#

  • ksp - iterative solver obtained from KSPCreate()

  • flag - PETSC_TRUE to reuse the current preconditioner, or PETSC_FALSE to construct a new preconditioner

Options Database Key#

  • -ksp_reuse_preconditioner <true,false> - reuse the previously computed preconditioner

Note#

When using SNES one can use SNESSetLagPreconditioner() to determine when preconditioners are reused.

See Also#

KSP: Linear System Solvers, KSPCreate(), KSPSolve(), KSPDestroy(), KSP, KSPGetReusePreconditioner(), SNESSetLagPreconditioner(), SNES

Level#

intermediate

Location#

src/ksp/ksp/interface/itfunc.c

Examples#

src/ksp/ksp/tutorials/ex6f.F90


Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages