Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:19 2012 Optimize a model with 518 rows, 101 columns and 1036 nonzeros Presolve removed 192 rows and 0 columns Presolve time: 0.00s Presolved: 326 rows, 101 columns, 819 nonzeros Variable types: 0 continuous, 101 integer (101 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.623529e+01, 230 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 36.23529 0 99 28.00000 36.23529 29.4% - 0s H 0 0 29.0000000 36.23529 24.9% - 0s 0 0 35.37143 0 100 29.00000 35.37143 22.0% - 0s 0 0 35.11448 0 101 29.00000 35.11448 21.1% - 0s 0 0 34.85617 0 99 29.00000 34.85617 20.2% - 0s 0 0 34.71209 0 100 29.00000 34.71209 19.7% - 0s 0 0 34.64798 0 99 29.00000 34.64798 19.5% - 0s H 0 0 30.0000000 34.64798 15.5% - 0s 0 0 34.55361 0 101 30.00000 34.55361 15.2% - 0s 0 0 34.54309 0 100 30.00000 34.54309 15.1% - 0s 0 0 34.46738 0 101 30.00000 34.46738 14.9% - 0s 0 0 34.42931 0 101 30.00000 34.42931 14.8% - 0s 0 0 34.40448 0 100 30.00000 34.40448 14.7% - 0s 0 0 34.30634 0 101 30.00000 34.30634 14.4% - 0s 0 0 34.21479 0 101 30.00000 34.21479 14.0% - 0s 0 0 34.17135 0 100 30.00000 34.17135 13.9% - 0s 0 0 34.15235 0 101 30.00000 34.15235 13.8% - 0s 0 0 34.15235 0 101 30.00000 34.15235 13.8% - 0s 0 2 34.14894 0 101 30.00000 34.14894 13.8% - 0s * 137 16 7 31.0000000 32.92593 6.21% 29.7 0s Cutting planes: Zero half: 59 Explored 166 nodes (5404 simplex iterations) in 0.24 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%