| Iteration | Direct method | Domain decomposition | ||
| Error | Reduction | Error | Reduction | |
| 0 | 1.288400e+03 | --- | 8.399300e+03 | --- |
| 3 | 1.081400e+02 | 0.689492 | 2.362800e+03 | 0.485394 |
| 13 | 8.052800e+00 | 0.917719 | 2.568000e+02 | 0.640958 |
| 24 | 4.379000e+00 | 0.955863 | 8.671400e−01 | 0.472788 |
| 35 | 3.490100e+00 | 0.964836 | 3.553900e−03 | 0.430791 |
| 46 | 2.343700e+00 | 0.967192 | 3.893700e−07 | 0.489318 |
| 54 | 1.830400e+00 | 0.973203 | 7.446200e−10 | 0.692799 |
| 200 | 2.023200e−01 | 0.981374 |
|
|
| 300 | 5.048100e−02 | 0.981586 |
|
|
| 430 | 4.493300e−03 | 0.983647 |
|
|
| 560 | 5.759100e−04 | 0.981659 |
|
|
| 697 | 4.573200e−05 | 0.978120 |
|
|
| 885 | 8.928400e−07 | 0.976550 |
|
|
| 1007 | 5.863900e−08 | 0.979455 |
|
|