Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:34 2012 Optimize a model with 952 rows, 63 columns and 1904 nonzeros Presolve removed 649 rows and 0 columns Presolve time: 0.02s Presolved: 303 rows, 63 columns, 1735 nonzeros Variable types: 0 continuous, 63 integer (63 binary) Found heuristic solution: objective 6.0000000 Root relaxation: objective 1.070825e+01, 148 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 10.70825 0 61 6.00000 10.70825 78.5% - 0s H 0 0 7.0000000 10.70825 53.0% - 0s H 0 0 8.0000000 10.70825 33.9% - 0s 0 0 10.45102 0 61 8.00000 10.45102 30.6% - 0s 0 0 10.38420 0 57 8.00000 10.38420 29.8% - 0s 0 0 10.34215 0 60 8.00000 10.34215 29.3% - 0s 0 0 10.30634 0 60 8.00000 10.30634 28.8% - 0s 0 0 10.28603 0 63 8.00000 10.28603 28.6% - 0s 0 0 10.28238 0 63 8.00000 10.28238 28.5% - 0s 0 0 10.26572 0 63 8.00000 10.26572 28.3% - 0s 0 0 10.26105 0 63 8.00000 10.26105 28.3% - 0s 0 0 10.25172 0 63 8.00000 10.25172 28.1% - 0s 0 0 10.23668 0 62 8.00000 10.23668 28.0% - 0s 0 0 10.23017 0 63 8.00000 10.23017 27.9% - 0s 0 0 10.22887 0 63 8.00000 10.22887 27.9% - 0s 0 0 10.22887 0 63 8.00000 10.22887 27.9% - 0s 0 2 10.22848 0 63 8.00000 10.22848 27.9% - 0s Cutting planes: Clique: 26 Zero half: 12 Explored 23 nodes (1437 simplex iterations) in 0.23 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.000000000000e+00, best bound 8.000000000000e+00, gap 0.0%