Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:56 2012 Optimize a model with 391 rows, 88 columns and 782 nonzeros Presolve removed 132 rows and 0 columns Presolve time: 0.00s Presolved: 259 rows, 88 columns, 633 nonzeros Variable types: 0 continuous, 88 integer (88 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.320833e+01, 178 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 33.20833 0 85 26.00000 33.20833 27.7% - 0s H 0 0 27.0000000 33.20833 23.0% - 0s 0 0 32.79221 0 85 27.00000 32.79221 21.5% - 0s 0 0 32.66024 0 87 27.00000 32.66024 21.0% - 0s 0 0 32.41580 0 85 27.00000 32.41580 20.1% - 0s 0 0 32.23952 0 84 27.00000 32.23952 19.4% - 0s 0 0 32.06897 0 85 27.00000 32.06897 18.8% - 0s H 0 0 28.0000000 32.06897 14.5% - 0s 0 0 31.78788 0 86 28.00000 31.78788 13.5% - 0s 0 0 31.75000 0 86 28.00000 31.75000 13.4% - 0s H 0 0 29.0000000 31.75000 9.48% - 0s 0 0 31.66447 0 85 29.00000 31.66447 9.19% - 0s 0 0 31.58605 0 85 29.00000 31.58605 8.92% - 0s 0 0 31.56539 0 83 29.00000 31.56539 8.85% - 0s 0 0 31.51019 0 85 29.00000 31.51019 8.66% - 0s 0 0 31.48837 0 84 29.00000 31.48837 8.58% - 0s 0 0 31.45073 0 84 29.00000 31.45073 8.45% - 0s 0 0 31.40353 0 81 29.00000 31.40353 8.29% - 0s 0 0 31.39326 0 84 29.00000 31.39326 8.25% - 0s 0 0 31.39326 0 81 29.00000 31.39326 8.25% - 0s 0 2 31.38298 0 81 29.00000 31.38298 8.22% - 0s Cutting planes: Gomory: 1 Clique: 1 Zero half: 40 Explored 30 nodes (1727 simplex iterations) in 0.11 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%