typedef const char *PCGAMGType; #define PCGAMGAGG "agg" #define PCGAMGGEO "geo" #define PCGAMGCLASSICAL "classical"
PCGAMGAGG - (the default) smoothed aggregation algorithm, robust, very well tested
PCGAMGGEO - geometric coarsening, uses mesh generator to produce coarser meshes, limited to triangles, not well tested
PCGAMGCLASSICAL - classical algebraic multigrid preconditioner, incomplete, poorly tested