Command: int PCGenBlockSSORSetGlobalFactorisation(PC pc) Option:T-pc_global_fac
Command: int PCGenBlockSSORSetNoGlobalFactorisation(PC pc) Option:T-pc_noglobal_fac
Determines whether on the block level the factorisation is of ILU (with global factorisation) or SSOR (without global factorisation) type. The default value is to have no global factorisation. This may considerably reduce the setup time; it also reduces the efficiency of the preconditioner.