Box partition

Each partition is a rectangular region of the global domain, described by the global offset of its upper left corner, and its local extents in the X and Y dimensions. The global extent in the X dimension must also be given. In this case, we have ig_paral(1:5):

• ig_paral(1) = 2 (indicates a Box partition)
• ig_paral(2) = the upper left corner global offset
• ig_paral(3) = the local extent in X
• ig_paral(4) = the local extent in Y
• ig_paral(5) = the global extent in X.

Figure 4.2 illustrates a Box partition over 3 processes.

Figure 4.2: Box partition