Table 2
Test configuration parameters and results (left: scaling baseline length uΥ; right: scaling field of view (FoV) size lΥ).
| Image size | Facet size | FoV | Data | FFT work | Accuracy | FoV | Data | FFT work | Accuracy | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| padded 4uΥlΥ | effective 4kuΥlB | padded 4uΥln | effective 4uΥlB | 2lfov | (GB) | facets (Gflop) | w-towers (Gflop) | RMSE | 2lfov | (GB) | facets (Gflop) | w-towers (Gflop) | RMSE |
| 196 608 | 159 744 | 49 152 | 39 936 | 0.322 | 997.0 | 131 273.7 | 1 137 193.0 | 9.80 ×10−6 | 0.322 | 997.0 | 131 273.8 | 1 137 196.6 | 9.80 ×10−6 |
| 163 840 | 133 120 | 40 960 | 33 280 | 0.322 | 982.6 | 81 939.9 | 1 123 209.5 | 9.90 ×10−6 | 0.268 | 561.0 | 63 325.4 | 616 494.7 | 1.15 ×10−5 |
| 131 072 | 106 496 | 32 768 | 26 624 | 0.322 | 918.9 | 45 456.9 | 1 066 548.9 | 9.64 ×10−6 | 0.215 | 280.7 | 26 406.9 | 293 813.3 | 1.29 ×10−5 |
| 114 688 | 93 176 | 28 672 | 23 296 | 0.322 | 826.1 | 31 014.4 | 988 129.3 | 9.33 ×10−6 | 0.188 | 187.7 | 15 267.7 | 190 949.7 | 1.35 ×10−5 |
| 98 304 | 79 872 | 24 576 | 19 968 | 0.322 | 678.9 | 20 192.4 | 860 429.7 | 9.93 ×10−6 | 0.161 | 119.9 | 8900 1 | 116 643.0 | 1.54 ×10−5 |
| 65 536 | 53 248 | 16 384 | 13 312 | 0.322 | 318.9 | 6952.6 | 428 050.5 | 1.08 ×10−5 | 0.107 | 39.8 | 2129.9 | 33 158.6 | 1.73 ×10−5 |
| 49 152 | 39 936 | 12 288 | 9984 | 0.322 | 163.8 | 2985.8 | 239 863.2 | 1.24 ×10−5 | 0.080 | 19.2 | 773.2 | 13677.3 | 1.97 ×10−5 |
| 32 768 | 26 624 | 8192 | 6656 | 0.322 | 63.9 | 904.0 | 102 354.0 | 1.29 ×10−5 | 0.054 | 7.7 | 138.6 | 4795.3 | 2.00 ×10−5 |
| 24 576 | 19 968 | 6144 | 4992 | 0.322 | 32.5 | 413.8 | 54 793.0 | 1.45 ×10−5 | 0.040 | 5.5 | 76.2 | 2693.6 | 2.17 ×10−5 |
| 16 384 | 13 312 | 4096 | 3328 | 0.322 | 17.5 | 161.9 | 33 241.0 | 1.54 ×10−5 | 0.027 | 3.7 | 34.4 | 1436.9 | 2.34 ×10−5 |
| 12 288 | 9 984 | 3072 | 2496 | 0.322 | 10 4 | 63.4 | 20 334.2 | 1.57 ×10−5 | 0.020 | 2.7 | 19.6 | 1129.9 | 2.46 ×10−5 |
| 8 192 | 6 656 | 2 048 | 1664 | 0.322 | 7.5 | 29.9 | 13 379.6 | 1.64 ×10−5 | 0.013 | 2.0 | 8.3 | 855.2 | 2.58 ×10−5 |
Notes. All using W = 4unln = 13.5625, facets k = 4, subgrid sizes 4uml×Υ = 1024 padded, 4uAlΥ = 896 effective. ‘Data’: all contribution terms exchanged; ‘FFT work’: operations spent on facet-w-tower FFTs; ‘Accuracy’: difference between degridded visibilities and DFT; ‘Time’: wall-clock from first facet to last visibility.
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