Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:55 2012 Optimize a model with 385 rows, 87 columns and 770 nonzeros Presolve removed 126 rows and 0 columns Presolve time: 0.00s Presolved: 259 rows, 87 columns, 610 nonzeros Variable types: 0 continuous, 87 integer (87 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.183721e+01, 163 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 31.83721 0 83 25.00000 31.83721 27.3% - 0s H 0 0 26.0000000 31.83721 22.5% - 0s H 0 0 27.0000000 31.83721 17.9% - 0s 0 0 31.00000 0 82 27.00000 31.00000 14.8% - 0s H 0 0 28.0000000 31.00000 10.7% - 0s 0 0 30.99031 0 85 28.00000 30.99031 10.7% - 0s 0 0 30.58571 0 85 28.00000 30.58571 9.23% - 0s 0 0 30.52468 0 86 28.00000 30.52468 9.02% - 0s 0 0 30.46918 0 86 28.00000 30.46918 8.82% - 0s 0 0 30.38421 0 84 28.00000 30.38421 8.52% - 0s 0 0 30.30323 0 85 28.00000 30.30323 8.23% - 0s 0 0 30.20599 0 84 28.00000 30.20599 7.88% - 0s 0 0 30.12856 0 84 28.00000 30.12856 7.60% - 0s 0 0 30.09434 0 85 28.00000 30.09434 7.48% - 0s 0 0 30.03089 0 85 28.00000 30.03089 7.25% - 0s 0 0 29.97368 0 85 28.00000 29.97368 7.05% - 0s 0 0 29.96667 0 87 28.00000 29.96667 7.02% - 0s 0 0 29.96667 0 87 28.00000 29.96667 7.02% - 0s 0 2 29.96667 0 86 28.00000 29.96667 7.02% - 0s Cutting planes: Zero half: 43 Explored 25 nodes (1460 simplex iterations) in 0.10 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%