Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:05 2012 Optimize a model with 446 rows, 94 columns and 892 nonzeros Presolve removed 153 rows and 1 columns Presolve time: 0.00s Presolved: 293 rows, 93 columns, 704 nonzeros Variable types: 0 continuous, 93 integer (93 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 3.368293e+01, 195 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 33.68293 0 90 23.00000 33.68293 46.4% - 0s H 0 0 25.0000000 33.68293 34.7% - 0s 0 0 32.84598 0 90 25.00000 32.84598 31.4% - 0s H 0 0 26.0000000 32.84598 26.3% - 0s 0 0 32.72778 0 91 26.00000 32.72778 25.9% - 0s 0 0 32.39108 0 93 26.00000 32.39108 24.6% - 0s 0 0 32.28622 0 90 26.00000 32.28622 24.2% - 0s 0 0 32.20370 0 93 26.00000 32.20370 23.9% - 0s 0 0 32.15306 0 93 26.00000 32.15306 23.7% - 0s H 0 0 27.0000000 32.15306 19.1% - 0s 0 0 32.11605 0 93 27.00000 32.11605 18.9% - 0s 0 0 32.06615 0 93 27.00000 32.06615 18.8% - 0s 0 0 32.06606 0 93 27.00000 32.06606 18.8% - 0s 0 0 32.06606 0 93 27.00000 32.06606 18.8% - 0s 0 2 32.05870 0 93 27.00000 32.05870 18.7% - 0s * 26 12 8 28.0000000 31.71612 13.3% 28.7 0s * 120 6 6 29.0000000 30.54206 5.32% 24.1 0s Cutting planes: Clique: 1 Zero half: 43 Explored 127 nodes (3577 simplex iterations) in 0.16 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.900000000000e+01, best bound 2.900000000000e+01, gap 0.0%