## Example 8

This is a two processor example which solves a similar problem to the one in Example 2, and Example 6 (The grid boxes are exactly those in the example diagram in the struct interface chapter of the User's Manual.)

The difference with the previous examples is that we use three parts, two with a 5-point and one with a 9-point discretization stencil. The solver is PCG with split-SMG preconditioner.

We recommend comparing this example with Example 2 and Example 6.