Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:40:07 2012 Optimize a model with 610 rows, 157 columns and 1220 nonzeros Presolve removed 111 rows and 0 columns Presolve time: 0.00s Presolved: 499 rows, 157 columns, 1079 nonzeros Variable types: 0 continuous, 157 integer (157 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 6.600000e+01, 296 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 66.00000 0 122 51.00000 66.00000 29.4% - 0s 0 0 64.36667 0 154 51.00000 64.36667 26.2% - 0s H 0 0 53.0000000 64.36667 21.4% - 0s 0 0 63.09932 0 156 53.00000 63.09932 19.1% - 0s 0 0 62.42580 0 154 53.00000 62.42580 17.8% - 0s H 0 0 54.0000000 62.42580 15.6% - 0s 0 0 62.25965 0 156 54.00000 62.25965 15.3% - 0s 0 0 62.14759 0 156 54.00000 62.14759 15.1% - 0s 0 0 62.09886 0 155 54.00000 62.09886 15.0% - 0s H 0 0 55.0000000 62.09886 12.9% - 0s 0 0 61.89679 0 156 55.00000 61.89679 12.5% - 0s 0 0 61.84245 0 155 55.00000 61.84245 12.4% - 0s 0 0 61.74133 0 155 55.00000 61.74133 12.3% - 0s 0 0 61.65121 0 157 55.00000 61.65121 12.1% - 0s 0 0 61.51667 0 156 55.00000 61.51667 11.8% - 0s 0 0 61.47135 0 157 55.00000 61.47135 11.8% - 0s 0 0 61.47135 0 156 55.00000 61.47135 11.8% - 0s 0 2 61.47127 0 156 55.00000 61.47127 11.8% - 0s 612 142 58.47191 10 154 55.00000 58.75362 6.82% 33.7 5s 625 150 57.35714 8 157 55.00000 58.75362 6.82% 33.0 10s Cutting planes: Gomory: 1 Zero half: 160 Explored 1661 nodes (59730 simplex iterations) in 13.43 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%