Gurobi 5.0.1 (linux64) logging started Tue Nov 20 06:25:30 2012 Optimize a model with 978 rows, 139 columns and 1956 nonzeros Presolve removed 383 rows and 0 columns Presolve time: 0.01s Presolved: 595 rows, 139 columns, 1557 nonzeros Variable types: 0 continuous, 139 integer (139 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 4.586940e+01, 384 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 45.86940 0 135 28.00000 45.86940 63.8% - 0s 0 0 45.50333 0 135 28.00000 45.50333 62.5% - 0s H 0 0 31.0000000 45.50333 46.8% - 0s 0 0 45.28073 0 136 31.00000 45.28073 46.1% - 0s 0 0 45.19529 0 138 31.00000 45.19529 45.8% - 0s 0 0 44.95558 0 138 31.00000 44.95558 45.0% - 0s 0 0 44.68455 0 138 31.00000 44.68455 44.1% - 0s 0 0 44.45530 0 138 31.00000 44.45530 43.4% - 0s 0 0 44.15856 0 136 31.00000 44.15856 42.4% - 0s 0 0 44.07175 0 136 31.00000 44.07175 42.2% - 0s 0 0 43.79102 0 137 31.00000 43.79102 41.3% - 0s H 0 0 32.0000000 43.79102 36.8% - 0s 0 0 43.70697 0 135 32.00000 43.70697 36.6% - 0s 0 0 43.65147 0 137 32.00000 43.65147 36.4% - 0s 0 0 43.64287 0 136 32.00000 43.64287 36.4% - 0s 0 0 43.63733 0 137 32.00000 43.63733 36.4% - 0s 0 0 43.63733 0 137 32.00000 43.63733 36.4% - 0s 0 2 43.63697 0 137 32.00000 43.63697 36.4% - 0s * 86 50 16 33.0000000 43.10370 30.6% 53.6 0s * 294 128 17 34.0000000 41.56054 22.2% 42.4 0s 611 275 38.82609 11 138 34.00000 40.79388 20.0% 40.9 5s 1948 692 38.46961 26 103 34.00000 39.73336 16.9% 40.8 10s 5848 1850 35.57951 22 78 34.00000 37.94245 11.6% 32.2 15s 10903 1822 cutoff 39 34.00000 36.69792 7.94% 28.4 20s Cutting planes: Gomory: 2 Clique: 3 Zero half: 52 Explored 15442 nodes (404181 simplex iterations) in 23.68 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.400000000000e+01, best bound 3.400000000000e+01, gap 0.0%