| -pc_syspfmg_its <its> number of iterations of SysPFMG to use as preconditioner | - . -pc_syspfmg_num_pre_relax <steps> number of smoothing steps before coarse grid | |
| -pc_syspfmg_num_post_relax <steps> number of smoothing steps after coarse grid | - . -pc_syspfmg_tol <tol> tolerance of SysPFMG | |
| -pc_syspfmg_relax_type | - relaxation type for the up and down cycles, one of Weighted-Jacobi,Red/Black-Gauss-Seidel |
This must be used with the MATHYPRESSTRUCT matrix type. This is less general than in hypre, it supports only one part, and one block per process defined by a PETSc DMDA. Also, only cell-centered variables.