| comm | - MPI communicator
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| bndx,bndy,bndz | - boundary type: DM_BOUNDARY_NONE, DM_BOUNDARY_PERIODIC, or DM_BOUNDARY_GHOSTED
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| M,N,P | - global number of grid points in x,y directions
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| m,n,p | - number of ranks in the x,y directions (may be PETSC_DECIDE)
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| dof0 | - number of degrees of freedom per vertex/point/node/0-cell
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| dof1 | - number of degrees of freedom per edge/1-cell
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| dof2 | - number of degrees of freedom per face/2-cell
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| dof3 | - number of degrees of freedom per element/3-cell
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| stencilType | - ghost/halo region type: DMSTAG_STENCIL_NONE, DMSTAG_STENCIL_BOX, or DMSTAG_STENCIL_STAR
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| stencilWidth | - width, in elements, of halo/ghost region
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| lx,ly,lz | - array sof local x,y,z element counts, of length equal to m,n,p, summing to M,N,P
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| -dm_view | - calls DMViewFromOptions() a the conclusion of DMSetUp()
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| -stag_grid_x <nx> | - number of elements in the x direction
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| -stag_grid_y <ny> | - number of elements in the y direction
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| -stag_grid_z <nz> | - number of elements in the z direction
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| -stag_ranks_x <rx> | - number of ranks in the x direction
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| -stag_ranks_y <ry> | - number of ranks in the y direction
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| -stag_ranks_z <rz> | - number of ranks in the z direction
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| -stag_ghost_stencil_width | - width of ghost region, in elements
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| -stag_boundary_type x <none,ghosted,periodic> | - DMBoundaryType value
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| -stag_boundary_type y <none,ghosted,periodic> | - DMBoundaryType value
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| -stag_boundary_type z <none,ghosted,periodic> | - DMBoundaryType value
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