Research Article
Block Preconditioners for Complex Symmetric Linear System with Two-by-Two Block Form
Table 1
IT and CPU for Example
1.
| | | Grid | | | | |
| | -GMRES(20) | IT | 2 | 2 | 2 | 2 | | CPU | 0.031 | 0.078 | 2.078 | 17.656 |
| | -GMRES(20) | IT | 2 | 2 | 2 | 2 | | CPU | 0.016 | 0.062 | 2.031 | 17.547 |
| | -GMRES(20) | IT | 4 | 5 | 6 | 6 | | CPU | 0.036 | 0.078 | 3.016 | 29.469 |
| | -GMRES(20) | IT | 4 | 4 | 5 | 5 | | CPU | 0.32 | 0.078 | 2.641 | 24.313 |
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