PCPARMSSetFill — PETSc 3.21.4 documentation

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# 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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