Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:38:58 2012 Optimize a model with 600 rows, 156 columns and 1200 nonzeros Presolve removed 136 rows and 0 columns Presolve time: 0.00s Presolved: 464 rows, 156 columns, 1018 nonzeros Variable types: 0 continuous, 156 integer (156 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.400000e+01, 261 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 64.00000 0 114 48.00000 64.00000 33.3% - 0s H 0 0 49.0000000 64.00000 30.6% - 0s 0 0 63.37500 0 137 49.00000 63.37500 29.3% - 0s H 0 0 50.0000000 63.37500 26.8% - 0s 0 0 63.08787 0 155 50.00000 63.08787 26.2% - 0s H 0 0 52.0000000 63.08787 21.3% - 0s 0 0 61.98276 0 150 52.00000 61.98276 19.2% - 0s 0 0 61.41962 0 151 52.00000 61.41962 18.1% - 0s 0 0 61.05305 0 152 52.00000 61.05305 17.4% - 0s 0 0 60.80908 0 155 52.00000 60.80908 16.9% - 0s 0 0 60.37992 0 154 52.00000 60.37992 16.1% - 0s 0 0 60.24747 0 153 52.00000 60.24747 15.9% - 0s 0 0 60.16357 0 151 52.00000 60.16357 15.7% - 0s 0 0 60.09796 0 152 52.00000 60.09796 15.6% - 0s 0 0 59.94789 0 151 52.00000 59.94789 15.3% - 0s 0 0 59.92451 0 154 52.00000 59.92451 15.2% - 0s 0 0 59.92451 0 153 52.00000 59.92451 15.2% - 0s 0 2 59.92451 0 153 52.00000 59.92451 15.2% - 0s * 43 22 11 54.0000000 59.72407 10.6% 35.8 0s H 101 37 55.0000000 58.85644 7.01% 41.1 0s Cutting planes: Zero half: 134 Explored 420 nodes (16749 simplex iterations) in 0.68 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%