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 SNES context.

  • 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_NGMRES_RESTART_DIFFERENCE, SNESNGMRES, SNESNGMRESRestartType, SNESNGMRESSetRestartType()

Level#

intermediate

Location#

src/snes/impls/ngmres/snesngmres.c

Implementations#

SNESNGMRESSetRestartFmRise_NGMRES in src/snes/impls/ngmres/snesngmres.c

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