petsc-3.4.4 2014-03-13

PCEisenstatNoDiagonalScaling

Causes 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  PCEisenstatNoDiagonalScaling(PC pc)
Logically Collective on PC

Input Parameter

pc -the preconditioner context

Options Database Key

-pc_eisenstat_no_diagonal_scaling -Activates PCEisenstatNoDiagonalScaling()

Note

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

Keywords

PC, Eisenstat, use, diagonal, scaling, SSOR

See Also

PCEisenstatSetOmega()

Level:intermediate
Location:
src/ksp/pc/impls/eisens/eisen.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages