PCPARMSSetFill#

Sets the fill-in parameters for ILUT, ILUK and ARMS preconditioners. Consider the original matrix A = [B F; E C] and the approximate version M = [LB 0; E/UB I]*[UB LB\F; 0 S].

Synopsis#

#include "petscpc.h" 
PetscErrorCode PCPARMSSetFill(PC pc, PetscInt lfil0, PetscInt lfil1, PetscInt lfil2)

Collective

Input Parameters#

  • pc - the preconditioner context

  • lfil0 - the level of fill-in kept in LB, UB, E/UB and LB\F

  • lfil1 - the level of fill-in kept in S

  • lfil2 - the level of fill-in kept in the L and U parts of the LU factorization of S

Options Database Keys#

  • -pc_parms_lfil_ilu_arms - set the amount of fill-in for ilut, iluk and arms

  • -pc_parms_lfil_schur - set the amount of fill-in for schur

  • -pc_parms_lfil_ilut_L_U - set the amount of fill-in for ILUT L and U

Note#

See the pARMS function parms_PCSetFill() for more information.

See Also#

KSP: Linear System Solvers, PCPARMS

Level#

intermediate

Location#

src/ksp/pc/impls/parms/parms.c

Implementations#

PCPARMSSetFill_PARMS() in src/ksp/pc/impls/parms/parms.c

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