Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:45 2012 Optimize a model with 490 rows, 142 columns and 980 nonzeros Presolve removed 88 rows and 4 columns Presolve time: 0.00s Presolved: 402 rows, 138 columns, 851 nonzeros Variable types: 0 continuous, 138 integer (138 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 6.175000e+01, 233 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 61.75000 0 120 46.00000 61.75000 34.2% - 0s H 0 0 48.0000000 61.75000 28.6% - 0s 0 0 60.10000 0 131 48.00000 60.10000 25.2% - 0s H 0 0 50.0000000 60.10000 20.2% - 0s H 0 0 51.0000000 60.10000 17.8% - 0s 0 0 59.51282 0 134 51.00000 59.51282 16.7% - 0s 0 0 58.92308 0 137 51.00000 58.92308 15.5% - 0s H 0 0 52.0000000 58.92308 13.3% - 0s 0 0 58.21951 0 136 52.00000 58.21951 12.0% - 0s 0 0 57.80835 0 132 52.00000 57.80835 11.2% - 0s H 0 0 53.0000000 57.80835 9.07% - 0s 0 0 57.31579 0 127 53.00000 57.31579 8.14% - 0s 0 0 57.16129 0 133 53.00000 57.16129 7.85% - 0s 0 0 57.07580 0 132 53.00000 57.07580 7.69% - 0s 0 0 57.00736 0 129 53.00000 57.00736 7.56% - 0s 0 0 56.98778 0 133 53.00000 56.98778 7.52% - 0s 0 0 56.98778 0 133 53.00000 56.98778 7.52% - 0s H 0 0 54.0000000 56.98778 5.53% - 0s 0 2 56.97323 0 132 54.00000 56.97323 5.51% - 0s H 17 3 55.0000000 56.70588 3.10% 36.2 0s Cutting planes: Gomory: 2 Zero half: 83 Explored 23 nodes (1941 simplex iterations) in 0.13 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%