PCEisenstatGetNoDiagonalScaling

Tells if the Eisenstat preconditioner not to do additional diagonal preconditioning. For matrices with a constant along the diagonal, this may save a small amount of work.

Synopsis

#include "petscpc.h" 
PetscErrorCode PCEisenstatGetNoDiagonalScaling(PC pc, PetscBool *flg)

Logically Collective

Input Parameter

• pc - the preconditioner context

Output Parameter

• flg - PETSC_TRUE means there is no diagonal scaling applied

Options Database Key

• -pc_eisenstat_no_diagonal_scaling - Activates PCEisenstatSetNoDiagonalScaling()

See Also

PCEISENSTAT, PCEisenstatGetOmega()

Level

intermediate

Location

src/ksp/pc/impls/eisens/eisen.c

Implementations

PCEisenstatGetNoDiagonalScaling_Eisenstat() in src/ksp/pc/impls/eisens/eisen.c

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