petsc-3.10.5 2019-03-28
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