Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:55 2012 Optimize a model with 538 rows, 148 columns and 1076 nonzeros Presolve removed 108 rows and 4 columns Presolve time: 0.00s Presolved: 430 rows, 144 columns, 915 nonzeros Variable types: 0 continuous, 144 integer (144 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.400000e+01, 214 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 64.00000 0 118 48.00000 64.00000 33.3% - 0s H 0 0 49.0000000 64.00000 30.6% - 0s 0 0 62.66667 0 135 49.00000 62.66667 27.9% - 0s H 0 0 53.0000000 62.66667 18.2% - 0s 0 0 62.10482 0 142 53.00000 62.10482 17.2% - 0s 0 0 61.34314 0 143 53.00000 61.34314 15.7% - 0s 0 0 60.85786 0 141 53.00000 60.85786 14.8% - 0s 0 0 60.51916 0 142 53.00000 60.51916 14.2% - 0s 0 0 60.33449 0 144 53.00000 60.33449 13.8% - 0s 0 0 60.06820 0 140 53.00000 60.06820 13.3% - 0s H 0 0 54.0000000 60.06820 11.2% - 0s 0 0 59.85362 0 144 54.00000 59.85362 10.8% - 0s 0 0 59.62667 0 143 54.00000 59.62667 10.4% - 0s 0 0 59.54478 0 144 54.00000 59.54478 10.3% - 0s 0 0 59.51255 0 144 54.00000 59.51255 10.2% - 0s 0 0 59.51255 0 144 54.00000 59.51255 10.2% - 0s 0 2 59.51163 0 144 54.00000 59.51163 10.2% - 0s * 32 17 6 55.0000000 59.32046 7.86% 46.2 0s * 147 10 7 56.0000000 57.93137 3.45% 40.9 0s Cutting planes: Gomory: 1 Clique: 1 Zero half: 145 Explored 164 nodes (7709 simplex iterations) in 0.33 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%