PCEisenstatSetNoDiagonalScaling#

Causes the Eisenstat preconditioner, PCEISENSTAT 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 PCEisenstatSetNoDiagonalScaling(PC pc, PetscBool flg)

Logically Collective

Input Parameters#

  • pc - the preconditioner context

  • flg - PETSC_TRUE turns off diagonal scaling inside the algorithm

Options Database Key#

Note#

If you use the KSPSetDiagonalScaling() or -ksp_diagonal_scale option then you will likely want to use this routine since it will save you some unneeded flops.

See Also#

PCEisenstatSetOmega(), PCEISENSTAT

Level#

intermediate

Location#

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

Implementations#

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

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