| dim | - dimension of the distributed array (1, 2, or 3)
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| M | - global dimension in first direction of the array
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| N | - global dimension in second direction of the array
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| P | - global dimension in third direction of the array
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| m | - corresponding number of procs in first dimension
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| n | - corresponding number of procs in second dimension
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| p | - corresponding number of procs in third dimension
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| dof | - number of degrees of freedom per node
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| s | - stencil width
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| bx | - type of ghost nodes at boundary in first dimension
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| by | - type of ghost nodes at boundary in second dimension
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| bz | - type of ghost nodes at boundary in third dimension
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| st | - stencil type, either DMDA_STENCIL_STAR or DMDA_STENCIL_BOX
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