Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:33 2012 Optimize a model with 540 rows, 104 columns and 1080 nonzeros Presolve removed 175 rows and 0 columns Presolve time: 0.00s Presolved: 365 rows, 104 columns, 871 nonzeros Variable types: 0 continuous, 104 integer (104 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.831818e+01, 225 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38.31818 0 102 26.00000 38.31818 47.4% - 0s H 0 0 28.0000000 38.31818 36.9% - 0s 0 0 37.43846 0 103 28.00000 37.43846 33.7% - 0s 0 0 36.91597 0 101 28.00000 36.91597 31.8% - 0s 0 0 36.72215 0 102 28.00000 36.72215 31.2% - 0s 0 0 36.59695 0 104 28.00000 36.59695 30.7% - 0s 0 0 36.37083 0 101 28.00000 36.37083 29.9% - 0s 0 0 36.30971 0 101 28.00000 36.30971 29.7% - 0s 0 0 36.18965 0 103 28.00000 36.18965 29.2% - 0s 0 0 36.11708 0 104 28.00000 36.11708 29.0% - 0s 0 0 36.07022 0 103 28.00000 36.07022 28.8% - 0s 0 0 36.01023 0 102 28.00000 36.01023 28.6% - 0s 0 0 36.00796 0 103 28.00000 36.00796 28.6% - 0s 0 0 36.00796 0 102 28.00000 36.00796 28.6% - 0s 0 2 36.00787 0 102 28.00000 36.00787 28.6% - 0s * 17 13 12 29.0000000 36.00787 24.2% 29.6 0s * 144 46 18 30.0000000 34.60452 15.3% 25.2 0s Cutting planes: Gomory: 1 Clique: 4 Zero half: 62 Explored 879 nodes (19244 simplex iterations) in 0.65 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+01, best bound 3.000000000000e+01, gap 0.0%