Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:07 2012 Optimize a model with 493 rows, 137 columns and 986 nonzeros Presolve removed 90 rows and 0 columns Presolve time: 0.00s Presolved: 403 rows, 137 columns, 865 nonzeros Variable types: 0 continuous, 137 integer (137 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 5.780000e+01, 274 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 57.80000 0 130 42.00000 57.80000 37.6% - 0s H 0 0 46.0000000 57.80000 25.7% - 0s 0 0 56.82698 0 132 46.00000 56.82698 23.5% - 0s H 0 0 48.0000000 56.82698 18.4% - 0s 0 0 56.30253 0 133 48.00000 56.30253 17.3% - 0s 0 0 55.65396 0 134 48.00000 55.65396 15.9% - 0s 0 0 55.12081 0 136 48.00000 55.12081 14.8% - 0s 0 0 54.62803 0 134 48.00000 54.62803 13.8% - 0s 0 0 54.46357 0 135 48.00000 54.46357 13.5% - 0s 0 0 54.33457 0 135 48.00000 54.33457 13.2% - 0s 0 0 54.18487 0 135 48.00000 54.18487 12.9% - 0s 0 0 54.00000 0 133 48.00000 54.00000 12.5% - 0s 0 0 53.92879 0 134 48.00000 53.92879 12.4% - 0s 0 0 53.88634 0 136 48.00000 53.88634 12.3% - 0s 0 0 53.88634 0 133 48.00000 53.88634 12.3% - 0s 0 2 53.88287 0 133 48.00000 53.88287 12.3% - 0s * 7 7 4 49.0000000 53.72379 9.64% 75.1 0s Cutting planes: Zero half: 120 Explored 412 nodes (13457 simplex iterations) in 0.54 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.900000000000e+01, best bound 4.900000000000e+01, gap 0.0%