Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:04:39 2012 Optimize a model with 815 rows, 172 columns and 1630 nonzeros Presolve removed 204 rows and 0 columns Presolve time: 0.00s Presolved: 611 rows, 172 columns, 1359 nonzeros Variable types: 0 continuous, 172 integer (172 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 6.663636e+01, 398 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 66.63636 0 163 49.00000 66.63636 36.0% - 0s 0 0 65.76773 0 169 49.00000 65.76773 34.2% - 0s 0 0 65.32575 0 169 49.00000 65.32575 33.3% - 0s 0 0 64.75836 0 169 49.00000 64.75836 32.2% - 0s 0 0 64.30354 0 170 49.00000 64.30354 31.2% - 0s H 0 0 50.0000000 64.30354 28.6% - 0s 0 0 63.97202 0 168 50.00000 63.97202 27.9% - 0s 0 0 63.66106 0 168 50.00000 63.66106 27.3% - 0s 0 0 63.41853 0 170 50.00000 63.41853 26.8% - 0s 0 0 63.21425 0 166 50.00000 63.21425 26.4% - 0s 0 0 63.04637 0 170 50.00000 63.04637 26.1% - 0s 0 0 63.01378 0 170 50.00000 63.01378 26.0% - 0s 0 0 62.99391 0 171 50.00000 62.99391 26.0% - 0s 0 0 62.99391 0 171 50.00000 62.99391 26.0% - 0s 0 2 62.99344 0 171 50.00000 62.99344 26.0% - 0s H 39 31 51.0000000 62.90172 23.3% 63.2 0s * 234 110 12 52.0000000 61.70393 18.7% 45.5 0s * 284 131 21 53.0000000 61.60323 16.2% 45.5 0s 615 311 54.72500 22 169 53.00000 60.60145 14.3% 40.0 5s 2591 1161 54.18182 33 125 53.00000 59.16863 11.6% 38.9 10s 6498 2703 54.37500 41 105 53.00000 57.64815 8.77% 31.7 15s 11476 3854 54.80000 29 112 53.00000 56.88136 7.32% 28.2 20s *14589 2989 39 54.0000000 56.50000 4.63% 27.0 22s 15780 2678 cutoff 31 54.00000 56.18182 4.04% 26.8 25s Cutting planes: Gomory: 1 Zero half: 82 Explored 19721 nodes (491972 simplex iterations) in 27.36 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.400000000000e+01, best bound 5.400000000000e+01, gap 0.0%