petsc-3.12.5 2020-03-29
SNESSetLagJacobianPersists
Set whether or not the Jacobian lagging persists through multiple solves
Synopsis
#include "petscsnes.h"
PetscErrorCode SNESSetLagJacobianPersists(SNES snes,PetscBool flg)
Logically collective on SNES
Input Parameter
| snes | - the SNES context
|
| flg | - jacobian 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 Jacobian be stale by
several solves, and for implicit time-stepping, where Jacobian lagging in the inner nonlinear solve over several
timesteps may present huge efficiency gains.
See Also
SNESSetLagPreconditionerPersists(), 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