Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:59 2012 Optimize a model with 440 rows, 90 columns and 880 nonzeros Presolve removed 161 rows and 0 columns Presolve time: 0.01s Presolved: 279 rows, 90 columns, 683 nonzeros Variable types: 0 continuous, 90 integer (90 binary) Found heuristic solution: objective 22.0000000 Root relaxation: objective 3.185185e+01, 191 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 31.85185 0 88 22.00000 31.85185 44.8% - 0s H 0 0 23.0000000 31.85185 38.5% - 0s H 0 0 24.0000000 31.85185 32.7% - 0s 0 0 31.49448 0 87 24.00000 31.49448 31.2% - 0s 0 0 31.29777 0 87 24.00000 31.29777 30.4% - 0s 0 0 31.11270 0 89 24.00000 31.11270 29.6% - 0s 0 0 30.98678 0 88 24.00000 30.98678 29.1% - 0s 0 0 30.96798 0 88 24.00000 30.96798 29.0% - 0s H 0 0 25.0000000 30.96798 23.9% - 0s 0 0 30.92734 0 87 25.00000 30.92734 23.7% - 0s 0 0 30.91111 0 89 25.00000 30.91111 23.6% - 0s 0 0 30.88321 0 89 25.00000 30.88321 23.5% - 0s 0 0 30.83804 0 88 25.00000 30.83804 23.4% - 0s 0 0 30.83077 0 89 25.00000 30.83077 23.3% - 0s 0 0 30.83077 0 89 25.00000 30.83077 23.3% - 0s 0 2 30.82690 0 89 25.00000 30.82690 23.3% - 0s H 7 7 26.0000000 30.82690 18.6% 38.6 0s * 15 9 8 27.0000000 30.82690 14.2% 24.4 0s Cutting planes: Clique: 3 Zero half: 33 Explored 117 nodes (3338 simplex iterations) in 0.16 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%