Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:53 2012 Optimize a model with 371 rows, 85 columns and 742 nonzeros Presolve removed 124 rows and 0 columns Presolve time: 0.00s Presolved: 247 rows, 85 columns, 598 nonzeros Variable types: 0 continuous, 85 integer (85 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.163636e+01, 155 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 31.63636 0 81 24.00000 31.63636 31.8% - 0s H 0 0 25.0000000 31.63636 26.5% - 0s 0 0 30.86898 0 81 25.00000 30.86898 23.5% - 0s H 0 0 26.0000000 30.86898 18.7% - 0s 0 0 30.39359 0 83 26.00000 30.39359 16.9% - 0s 0 0 30.35271 0 84 26.00000 30.35271 16.7% - 0s 0 0 30.25311 0 79 26.00000 30.25311 16.4% - 0s 0 0 30.20075 0 81 26.00000 30.20075 16.2% - 0s H 0 0 27.0000000 30.20075 11.9% - 0s 0 0 30.15533 0 83 27.00000 30.15533 11.7% - 0s 0 0 30.10167 0 79 27.00000 30.10167 11.5% - 0s 0 0 30.04853 0 81 27.00000 30.04853 11.3% - 0s 0 0 29.99357 0 81 27.00000 29.99357 11.1% - 0s 0 0 29.97117 0 80 27.00000 29.97117 11.0% - 0s 0 0 29.96438 0 81 27.00000 29.96438 11.0% - 0s 0 0 29.96438 0 81 27.00000 29.96438 11.0% - 0s 0 2 29.96272 0 81 27.00000 29.96272 11.0% - 0s Cutting planes: Zero half: 38 Explored 84 nodes (2571 simplex iterations) in 0.12 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.700000000000e+01, best bound 2.700000000000e+01, gap 0.0%