PCMGType

Determines the type of multigrid method that is run.

typedef enum { PC_MG_MULTIPLICATIVE,PC_MG_ADDITIVE,PC_MG_FULL,PC_MG_KASKADE } PCMGType;

	PC_MG_MULTIPLICATIVE (default)	- traditional V or W cycle as determined by PCMGSetCycles()
	PC_MG_ADDITIVE	- the additive multigrid preconditioner where all levels are smoothed before updating the residual. This only uses the down smoother, in the preconditioner the upper smoother is ignored
	PC_MG_FULL	- same as multiplicative except one also performs grid sequencing, that is starts on the coarsest grid, performs a cycle, interpolates to the next, performs a cycle etc
	PC_MG_KASKADE	- like full multigrid except one never goes back to a coarser level from a finer