The Preconditioners

  Available ParPre preconditioner types are, with their type and option listed:

PCAdditiveSchwarz

with option addschwarz; section 4. This method and the next are based on overlapping domain decomposition.

PCMultiplicativeSchwarz

with option mulschwarz; section 5.

PCGenBlockSSOR

with option genblockssor; section 6. A generalisation of SSOR and ILU methods.

PCDomainDecomp

with option domdecomp; section 7. A Schur complement method based on domain decompositioning with an interface system.

PCMultiLevel

with option multilevel; section 8. A collection of multilevel incomplete factorisations and algebraic multigrid methods.

The use of these identifiers and options is explained in section 2.2.