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#

Notes#

Only implemented for the MATAIJ matrix format.

Not a true parallel SOR, in parallel this implementation corresponds to block Jacobi with SOR on each block.

Developer Note#

Since this algorithm runs the Krylov method on a transformed linear system the implementation provides PCPreSolve() and PCPostSolve() routines that KSP uses to set up the transformed linear system.

See Also#

PCCreate(), PCSetType(), PCType, PC, PCEisenstatGetOmega(), PCEisenstatSetNoDiagonalScaling(), PCEisenstatSetOmega(), PCSOR

Level#

beginner

Location#

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


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Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages