PCPreSolve#

Optional pre-solve phase, intended for any preconditioner-specific actions that must be performed before the iterative solve itself.

Synopsis#

#include "petscksp.h" 
PetscErrorCode PCPreSolve(PC pc, KSP ksp)

Collective

Input Parameters#

pc - the preconditioner context
ksp - the Krylov subspace context

Sample of Usage#

    PCPreSolve(pc,ksp);
    KSPSolve(ksp,b,x);
    PCPostSolve(pc,ksp);

Notes#

The pre-solve phase is distinct from the PCSetUp() phase.

KSPSolve() calls this directly, so is rarely called by the user.

See Also#

PC, PCPostSolve()

Level#

developer

Location#

src/ksp/pc/interface/precon.c

Implementations#

PCPreSolve_BDDC in src/ksp/pc/impls/bddc/bddc.c
PCPreSolve_Deflation in src/ksp/pc/impls/deflation/deflation.c
PCPreSolve_Eisenstat in src/ksp/pc/impls/eisens/eisen.c
PCPreSolve_HPDDM in src/ksp/pc/impls/hpddm/pchpddm.cxx
PCPreSolve_Shell in src/ksp/pc/impls/shell/shellpc.c
PCPreSolve_PDIPM in src/tao/constrained/impls/ipm/pdipm.c

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