Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:40:23 2012 Optimize a model with 648 rows, 157 columns and 1296 nonzeros Presolve removed 134 rows and 2 columns Presolve time: 0.00s Presolved: 514 rows, 155 columns, 1110 nonzeros Variable types: 0 continuous, 155 integer (155 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 6.500000e+01, 259 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 65.00000 0 126 45.00000 65.00000 44.4% - 0s H 0 0 47.0000000 65.00000 38.3% - 0s 0 0 63.72727 0 148 47.00000 63.72727 35.6% - 0s H 0 0 51.0000000 63.72727 25.0% - 0s 0 0 63.00000 0 122 51.00000 63.00000 23.5% - 0s 0 0 62.56815 0 153 51.00000 62.56815 22.7% - 0s 0 0 62.04883 0 153 51.00000 62.04883 21.7% - 0s 0 0 61.46078 0 154 51.00000 61.46078 20.5% - 0s 0 0 61.10378 0 155 51.00000 61.10378 19.8% - 0s 0 0 60.69723 0 155 51.00000 60.69723 19.0% - 0s 0 0 60.42098 0 154 51.00000 60.42098 18.5% - 0s 0 0 60.23378 0 154 51.00000 60.23378 18.1% - 0s 0 0 60.15131 0 155 51.00000 60.15131 17.9% - 0s 0 0 60.12744 0 154 51.00000 60.12744 17.9% - 0s 0 0 60.09524 0 154 51.00000 60.09524 17.8% - 0s 0 0 60.09524 0 154 51.00000 60.09524 17.8% - 0s 0 2 60.09512 0 154 51.00000 60.09512 17.8% - 0s * 40 17 8 53.0000000 59.83046 12.9% 57.3 0s 615 138 55.95161 13 151 53.00000 56.75000 7.08% 43.1 5s Cutting planes: Gomory: 3 Zero half: 70 Explored 2285 nodes (82936 simplex iterations) in 8.15 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%