Preconditioner - HYPRE - PILUT
Usage:
-pc_type hypre -pc_hypre_type pilut
Options:
-pc_hypre_pilut_maxiter
Number of iterations. Default = -2
-pc_hypre_pilut_tol
Drop tolerance. Default = -2
-pc_hypre_pilut_factorrowsize
FactorRowSize xt. Default = -2
Info: Since the hypre preconditioner can be utilized as a solver as well, sometimes this should be run with the option
-ksp_type preonly