SNESNGMRESSetRestartFmRise#
Increase the restart count if the step x_M increases the residual F_M
Synopsis#
#include "petscsnes.h"
PetscErrorCode SNESNGMRESSetRestartFmRise(SNES snes, PetscBool flg)
Input Parameters#
snes - the
SNEScontext.flg - boolean value deciding whether to use the option or not, default is
PETSC_FALSE
Options Database Key#
-snes_ngmres_restart_fm_rise - Increase the restart count if the step x_M increases the residual F_M
Notes#
If the proposed step x_M increases the residual F_M, it might be trying to get out of a stagnation area. To help the solver do that, reset the Krylov subspace whenever F_M increases.
This option must be used with the SNESNGMRES SNESNGMRESRestartType of SNES_NGMRES_RESTART_DIFFERENCE
See Also#
SNES: Nonlinear Solvers, SNES, SNES_NGMRES_RESTART_DIFFERENCE, SNESNGMRES, SNESNGMRESRestartType, SNESNGMRESSetRestartType()
Level#
intermediate
Location#
Implementations#
SNESNGMRESSetRestartFmRise_NGMRES() in src/snes/impls/ngmres/snesngmres.c
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