Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:38 2012 Optimize a model with 509 rows, 146 columns and 1018 nonzeros Presolve removed 113 rows and 3 columns Presolve time: 0.00s Presolved: 396 rows, 143 columns, 854 nonzeros Variable types: 0 continuous, 143 integer (143 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.075000e+01, 255 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.75000 0 137 48.00000 60.75000 26.6% - 0s H 0 0 49.0000000 60.75000 24.0% - 0s H 0 0 50.0000000 60.75000 21.5% - 0s 0 0 60.07308 0 139 50.00000 60.07308 20.1% - 0s 0 0 58.85000 0 138 50.00000 58.85000 17.7% - 0s 0 0 58.07864 0 139 50.00000 58.07864 16.2% - 0s H 0 0 53.0000000 58.07864 9.58% - 0s 0 0 57.56707 0 141 53.00000 57.56707 8.62% - 0s 0 0 57.47627 0 139 53.00000 57.47627 8.45% - 0s 0 0 57.28571 0 138 53.00000 57.28571 8.09% - 0s 0 0 57.20120 0 135 53.00000 57.20120 7.93% - 0s 0 0 57.16056 0 135 53.00000 57.16056 7.85% - 0s 0 0 57.12377 0 140 53.00000 57.12377 7.78% - 0s 0 0 57.12377 0 140 53.00000 57.12377 7.78% - 0s 0 2 57.11746 0 140 53.00000 57.11746 7.77% - 0s H 12 10 54.0000000 56.88235 5.34% 28.6 0s H 30 4 55.0000000 56.82699 3.32% 31.5 0s Cutting planes: Zero half: 72 Explored 45 nodes (2245 simplex iterations) in 0.14 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%