Research Article
Block Preconditioners for Complex Symmetric Linear System with Two-by-Two Block Form
Table 2
IT and CPU for Example
2.
| | | Grid | | | | |
| | -GMRES(20) | IT | 2 | 2 | 2 | 2 | | CPU | 0.031 | 0.093 | 2.031 | 16.802 |
| | -GMRES(20) | IT | 2 | 2 | 2 | 2 | | CPU | 0.016 | 0.047 | 1.985 | 16.672 |
| | -GMRES(20) | IT | 5 | 5 | 5 | 4 | | CPU | 0.048 | 0.062 | 2.672 | 19.678 |
| | -GMRES(20) | IT | 4 | 4 | 4 | 4 | | CPU | 0.32 | 0.063 | 2.282 | 20.078 |
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