#include "petscsnes.h" PetscErrorCode SNESSetLagPreconditioner(SNES snes,PetscInt lag)Logically Collective on SNES
snes | - the SNES context | |
lag | - 1 means rebuild every time the Jacobian is computed within a single nonlinear solve, 2 means every second time the Jacobian is built etc. -2 indicates rebuild preconditioner at next chance but then never rebuild after that |
-snes_lag_jacobian_persists <true,false> | - sets the persistence | |
-snes_lag_jacobian < | - 2,1,2,...> - sets the lag | |
-snes_lag_preconditioner_persists <true,false> | - sets the persistence | |
-snes_lag_preconditioner < | - 2,1,2,...> - sets the lag |
SNESSetLagPreconditionerPersists() allows using the same uniform lagging (for example every second solve) across multiple solves.