int HYPRE_BoomerAMGSetRelaxOrder (HYPRE_Solver solver, int relax_order)

(Optional) Defines in which order the points are relaxed

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(Optional) Defines in which order the points are relaxed. There are the following options for relax_order:

0 the points are relaxed in natural or lexicographic order on each processor
1 CF-relaxation is used, i.e on the fine grid and the down cycle the coarse points are relaxed first,
followed by the fine points; on the up cycle the F-points are relaxed first, followed by the C-points.
On the coarsest level, if an iterative scheme is used, the points are relaxed in lexicographic order.

The default is 1 (CF-relaxation).

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