Each partition is a segment of the global domain, described by its
global offset and its local size. In this case, we have ig_paral(1:3):
- ig_paral(1) = 1 (indicates an Apple partition)
- ig_paral(2) = the segment global offset
- ig_paral(3) = the segment local size
Figure 2.3 illustrates an Apple partition over 3
Apple partition. It is assumed here that the global index starts at
0 in the upper left corner.