petsc-3.9.0 2018-04-07
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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 on PC

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.

Keywords

PC, pre-solve

See Also

PCPostSolve()

Level

developer

Location

src/ksp/pc/interface/precon.c

Implementations

PCPreSolve_BDDC in src/ksp/pc/impls/bddc/bddc.c
PCPreSolve_Eisenstat in src/ksp/pc/impls/eisens/eisen.c
PCPreSolve_Shell in src/ksp/pc/impls/shell/shellpc.c

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