Table 1
Iteration numbers, relative rms errors, computational times, and speedups of RL and SGP, provided by the corresponding GPU implementations, for the three 256 × 256 objects nebula, galaxy and Crab.
| Nebula (m = 10) | Galaxy (m = 10) | Crab (m = 10) | ||||||||||
| Algorithm | It | Err | Sec | SpUp | It | Err | Sec | SpUp | It | Err | Sec | SpUp |
|
|
||||||||||||
| RL | 528 | 0.021 | 41.28 | – | 10 000∗ | 0.140 | 795.3 | – | 5353 | 0.128 | 419.8 | – |
| RL_CUDA | 528 | 0.021 | 2.079 | 19.9 | 10 000∗ | 0.140 | 35.09 | 22.7 | 5353 | 0.128 | 19.45 | 21.6 |
| SGP | 50 | 0.021 | 4.719 | – | 406 | 0.141 | 38.61 | – | 151 | 0.129 | 14.28 | – |
| SGP_CUDA | 50 | 0.021 | 0.344 | 13.7 | 406 | 0.142 | 3.313 | 11.7 | 151 | 0.129 | 1.219 | 11.7 |
|
|
||||||||||||
| Nebula (m = 12) | Galaxy (m = 12) | Crab (m = 12) | ||||||||||
| Algorithm | It | Err | Sec | SpUp | It | Err | Sec | SpUp | It | Err | Sec | SpUp |
|
|
||||||||||||
| RL | 124 | 0.026 | 9.797 | – | 3887 | 0.157 | 304.6 | – | 954 | 0.136 | 74.83 | – |
| RL_CUDA | 124 | 0.026 | 0.516 | 19.0 | 3887 | 0.157 | 14.50 | 21.0 | 954 | 0.136 | 3.516 | 21.3 |
| SGP | 24 | 0.026 | 2.344 | – | 153 | 0.159 | 14.42 | – | 52 | 0.137 | 4.984 | – |
| SGP_CUDA | 24 | 0.026 | 0.203 | 11.5 | 153 | 0.159 | 1.266 | 11.4 | 52 | 0.137 | 0.406 | 12.3 |
|
|
||||||||||||
| Nebula (m = 15) | Galaxy (m = 15) | Crab (m = 15) | ||||||||||
| Algorithm | It | Err | Sec | SpUp | It | Err | Sec | SpUp | It | Err | Sec | SpUp |
|
|
||||||||||||
| RL | 124 | 0.063 | 9.766 | – | 448 | 0.234 | 35.14 | – | 128 | 0.172 | 10.09 | – |
| RL_CUDA | 124 | 0.063 | 0.469 | 20.8 | 448 | 0.234 | 1.594 | 22.0 | 128 | 0.172 | 0.483 | 20.9 |
| SGP | 12 | 0.060 | 1.250 | – | 21 | 0.234 | 2.094 | – | 10 | 0.172 | 1.093 | – |
| SGP_CUDA | 12 | 0.060 | 0.109 | 11.5 | 21 | 0.234 | 0.156 | 13.4 | 10 | 0.172 | 0.093 | 11.8 |
Notes. Iterations are stopped at a minimum relative rms error in the serial algorithms (the asterisks denote the maximum number of iterations allowed).
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