Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:02 2012 Optimize a model with 458 rows, 92 columns and 916 nonzeros Presolve removed 157 rows and 0 columns Presolve time: 0.00s Presolved: 301 rows, 92 columns, 731 nonzeros Variable types: 0 continuous, 92 integer (92 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.288158e+01, 187 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 32.88158 0 89 27.00000 32.88158 21.8% - 0s 0 0 32.56362 0 92 27.00000 32.56362 20.6% - 0s 0 0 32.25000 0 90 27.00000 32.25000 19.4% - 0s 0 0 32.23711 0 89 27.00000 32.23711 19.4% - 0s 0 0 32.15084 0 92 27.00000 32.15084 19.1% - 0s 0 0 32.04000 0 92 27.00000 32.04000 18.7% - 0s 0 0 31.94483 0 91 27.00000 31.94483 18.3% - 0s 0 0 31.92060 0 92 27.00000 31.92060 18.2% - 0s 0 0 31.89864 0 90 27.00000 31.89864 18.1% - 0s 0 0 31.84823 0 90 27.00000 31.84823 18.0% - 0s 0 0 31.78951 0 90 27.00000 31.78951 17.7% - 0s 0 0 31.69361 0 90 27.00000 31.69361 17.4% - 0s 0 0 31.67306 0 90 27.00000 31.67306 17.3% - 0s 0 0 31.66591 0 91 27.00000 31.66591 17.3% - 0s 0 0 31.66591 0 91 27.00000 31.66591 17.3% - 0s 0 2 31.66570 0 91 27.00000 31.66570 17.3% - 0s * 172 13 16 28.0000000 29.79726 6.42% 21.9 0s Cutting planes: Clique: 2 Zero half: 47 Explored 196 nodes (4879 simplex iterations) in 0.22 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%