Research Article
A Decomposition Heuristic for the Maximal Covering Location Problem
Table 1
Computation times for SJC instances,
.
| | | | | | k = 10 | k = 50 |
| n | p | Optimal | GapLP | CPU | Cuts | Gap | CPUSeq | CPUPar | Cuts | Gap | CPUSeq | CPUPar |
| 324 | 20 | 7302 | 0.000 | 0.015 | 296 | 0.000 | 2.543 | 2.537 | 1449 | 0.000 | 9.875 | 9.739 | 30 | 9127 | 0.027 | 0.047 | 0.027 | 24.650 | 24.635 | 0.027 | 44.596 | 41.101 | 40 | 10443 | 0.156 | 0.188 | 0.108 | 25.985 | 25.969 | 0.157 | 45.122 | 42.353 | 50 | 11397 | 0.180 | 0.391 | 0.138 | 24.452 | 24.422 | 0.195 | 43.748 | 43.459 | 60 | 11991 | 0.184 | 0.235 | 0.024 | 44.514 | 44.421 | 0.221 | 48.049 | 47.909 | 80 | 12152 | 0.000 | 0.031 | 0.000 | 8.876 | 8.816 | 0.003 | 109.129 | 108.115 | 108 | 12152 | 0.000 | 0.016 | 0.000 | 1.595 | 1.595 | 2.977 | 26.533 | 26.487 |
| 500 | 40 | 13340 | 0.000 | 0.047 | 108 | 0.000 | 3.453 | 3.361 | 804 | 0.000 | 17.186 | 11.499 | 50 | 14773 | 0.014 | 0.047 | 0.000 | 4.938 | 4.514 | 0.014 | 59.019 | 36.293 | 60 | 15919 | 0.048 | 0.063 | 0.000 | 8.233 | 7.243 | 0.048 | 57.157 | 34.737 | 70 | 16908 | 0.000 | 0.031 | 0.000 | 3.723 | 3.370 | 0.000 | 22.891 | 14.421 | 80 | 17749 | 0.000 | 0.015 | 0.000 | 5.406 | 4.766 | 0.000 | 26.686 | 16.697 | 100 | 18912 | 0.098 | 0.109 | 0.000 | 10.276 | 7.171 | 0.056 | 62.071 | 37.748 | 130 | 19664 | 0.041 | 0.297 | 0.015 | 30.827 | 24.588 | 0.041 | 69.934 | 43.373 | 167 | 19706 | 0.005 | 0.047 | 0.003 | 14.600 | 14.235 | 0.005 | 46.078 | 35.414 |
| 818 | 80 | 23325 | 0.055 | 0.140 | 166 | 0.003 | 45.564 | 21.880 | 1649 | 0.061 | 85.922 | 45.819 | 90 | 24455 | 0.123 | 0.266 | 0.041 | 56.388 | 24.747 | 0.143 | 87.797 | 47.001 | 100 | 25435 | 0.127 | 0.344 | 0.012 | 87.279 | 34.481 | 0.140 | 96.124 | 52.060 | 120 | 26982 | 0.084 | 0.297 | 0.015 | 69.658 | 31.368 | 0.062 | 105.547 | 54.658 | 140 | 28002 | 0.140 | 0.359 | 0.095 | 52.966 | 26.271 | 0.128 | 121.127 | 63.713 | 160 | 28699 | 0.128 | 0.391 | 0.107 | 58.453 | 24.904 | 0.126 | 96.017 | 50.828 | 200 | 29153 | 0.018 | 0.234 | 0.011 | 61.531 | 28.301 | 0.039 | 253.908 | 135.048 | 273 | 29168 | 0.000 | 0.031 | 0.000 | 3.343 | 2.545 | 0.554 | 46.766 | 37.178 |
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