petsc-3.9.4 2018-09-11
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PCEISENSTAT

 An implementation of SSOR (symmetric successive over relaxation, symmetric Gauss-Seidel) preconditioning that incorporates Eisenstat's trick to reduce the amount of computation needed.

Options Database Keys

-pc_eisenstat_omega <omega> - Sets omega
-pc_eisenstat_no_diagonal_scaling - Activates PCEisenstatSetNoDiagonalScaling()

Notes: Only implemented for the SeqAIJ matrix format. Not a true parallel SOR, in parallel this implementation corresponds to block Jacobi with SOR on each block.

See Also

PCCreate(), PCSetType(), PCType (for list of available types), PC,
PCEisenstatSetNoDiagonalScaling(), PCEisenstatSetOmega(), PCSOR

Level

beginner

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