petsc-3.9.4 2018-09-11
SNESSetLagPreconditionerPersists
Set whether or not the preconditioner lagging persists through multiple solves
Synopsis
#include "petscsnes.h"
PetscErrorCode SNESSetLagPreconditionerPersists(SNES snes,PetscBool flg)
Logically Collective on SNES
Input Parameter
| snes | - the SNES context
|
| flg | - preconditioner lagging persists if true
|
Options Database Keys
-snes_lag_jacobian_persists <flg> -
Notes: This is useful both for nonlinear preconditioning, where it's appropriate to have the preconditioner be stale
by several solves, and for implicit time-stepping, where preconditioner lagging in the inner nonlinear solve over
several timesteps may present huge efficiency gains.
Keywords
SNES, nonlinear, lag
See Also
SNESSetLagJacobianPersists(), SNESSetLagJacobian(), SNESGetLagJacobian(), SNESGetNPC()
Level
developer
Location
src/snes/interface/snes.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages