Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:01 2012 Optimize a model with 427 rows, 92 columns and 854 nonzeros Presolve removed 145 rows and 0 columns Presolve time: 0.00s Presolved: 282 rows, 92 columns, 673 nonzeros Variable types: 0 continuous, 92 integer (92 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.437288e+01, 170 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 34.37288 0 88 24.00000 34.37288 43.2% - 0s H 0 0 28.0000000 34.37288 22.8% - 0s 0 0 33.71617 0 86 28.00000 33.71617 20.4% - 0s 0 0 33.65312 0 88 28.00000 33.65312 20.2% - 0s 0 0 33.55118 0 88 28.00000 33.55118 19.8% - 0s 0 0 33.12809 0 90 28.00000 33.12809 18.3% - 0s 0 0 32.97116 0 90 28.00000 32.97116 17.8% - 0s 0 0 32.87387 0 91 28.00000 32.87387 17.4% - 0s 0 0 32.78401 0 91 28.00000 32.78401 17.1% - 0s 0 0 32.67276 0 90 28.00000 32.67276 16.7% - 0s 0 0 32.61868 0 91 28.00000 32.61868 16.5% - 0s H 0 0 29.0000000 32.61868 12.5% - 0s 0 0 32.58037 0 90 29.00000 32.58037 12.3% - 0s 0 0 32.56154 0 91 29.00000 32.56154 12.3% - 0s 0 0 32.56154 0 91 29.00000 32.56154 12.3% - 0s 0 2 32.55825 0 91 29.00000 32.55825 12.3% - 0s Cutting planes: Clique: 1 Zero half: 51 Explored 103 nodes (3111 simplex iterations) in 0.15 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%