Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:38:29 2012 Optimize a model with 634 rows, 155 columns and 1268 nonzeros Presolve removed 137 rows and 0 columns Presolve time: 0.00s Presolved: 497 rows, 155 columns, 1086 nonzeros Variable types: 0 continuous, 155 integer (155 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.425000e+01, 299 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 64.25000 0 127 47.00000 64.25000 36.7% - 0s H 0 0 48.0000000 64.25000 33.9% - 0s 0 0 62.95266 0 154 48.00000 62.95266 31.2% - 0s 0 0 62.31818 0 154 48.00000 62.31818 29.8% - 0s 0 0 61.75784 0 155 48.00000 61.75784 28.7% - 0s 0 0 61.02569 0 154 48.00000 61.02569 27.1% - 0s H 0 0 50.0000000 61.02569 22.1% - 0s 0 0 60.59896 0 155 50.00000 60.59896 21.2% - 0s H 0 0 51.0000000 60.59896 18.8% - 0s 0 0 60.26501 0 155 51.00000 60.26501 18.2% - 0s 0 0 60.19191 0 154 51.00000 60.19191 18.0% - 0s 0 0 60.08028 0 153 51.00000 60.08028 17.8% - 0s 0 0 60.06102 0 152 51.00000 60.06102 17.8% - 0s 0 0 59.97861 0 155 51.00000 59.97861 17.6% - 0s 0 0 59.96644 0 155 51.00000 59.96644 17.6% - 0s 0 0 59.96644 0 154 51.00000 59.96644 17.6% - 0s H 0 0 52.0000000 59.96644 15.3% - 0s 0 2 59.96537 0 154 52.00000 59.96537 15.3% - 0s H 54 30 53.0000000 59.44059 12.2% 49.2 0s H 252 74 54.0000000 58.20552 7.79% 42.4 0s 613 141 55.66667 12 154 54.00000 57.25070 6.02% 37.4 5s Cutting planes: Gomory: 2 Clique: 1 Zero half: 61 Mod-K: 1 Explored 1439 nodes (53976 simplex iterations) in 7.59 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.400000000000e+01, best bound 5.400000000000e+01, gap 0.0%