KSPFGMRESSetModifyPC#

Sets the routine used by KSPFGMRES to modify the preconditioner. Flexible Krylov Methods

Synopsis#

#include "petscksp.h" 
PetscErrorCode KSPFGMRESSetModifyPC(KSP ksp, PetscErrorCode (*fcn)(KSP, PetscInt, PetscInt, PetscReal, void *), void *ctx, PetscErrorCode (*d)(void *))

Logically Collective

Input Parameters#

  • ksp - iterative context obtained from KSPCreate()

  • fcn - modifypc function

  • ctx - optional context

  • d - optional context destroy routine

Calling Sequence of function#

PetscErrorCode fcn(KSP ksp, PetscInt total_its, PetscInt loc_its, PetscReal res_norm, void *ctx);

  • ksp - the ksp context being used.

  • total_its - the total number of FGMRES iterations that have occurred.

  • loc_its - the number of FGMRES iterations since last restart.

  • res_norm - the current residual norm.

  • ctx - optional context variable

Calling Sequence of d#

PetscErrorCode d(void *ctx)

Options Database Keys#

  • -ksp_fgmres_modifypcnochange - do not change the PC

  • -ksp_fgmres_modifypcksp - changes the inner KSP solver tolerances

Note#

Several modifypc routines are predefined, including KSPFGMRESModifyPCNoChange(), and KSPFGMRESModifyPCKSP()

See Also#

KSP: Linear System Solvers, Flexible Krylov Methods, KSPFGMRES, KSPFGMRESModifyPCNoChange(), KSPFGMRESModifyPCKSP()

Level#

intermediate

Location#

src/ksp/ksp/impls/gmres/fgmres/modpcf.c

Implementations#

KSPFGMRESSetModifyPC_FGMRES in src/ksp/ksp/impls/gmres/fgmres/fgmres.c

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