Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:43:45 2012 Optimize a model with 1137 rows, 67 columns and 2274 nonzeros Presolve removed 799 rows and 0 columns Presolve time: 0.02s Presolved: 338 rows, 67 columns, 2107 nonzeros Variable types: 0 continuous, 67 integer (67 binary) Found heuristic solution: objective 6.0000000 Root relaxation: objective 1.073554e+01, 175 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 10.73554 0 62 6.00000 10.73554 78.9% - 0s H 0 0 8.0000000 10.73554 34.2% - 0s 0 0 10.46755 0 65 8.00000 10.46755 30.8% - 0s 0 0 10.41336 0 65 8.00000 10.41336 30.2% - 0s 0 0 10.38719 0 65 8.00000 10.38719 29.8% - 0s 0 0 10.36835 0 66 8.00000 10.36835 29.6% - 0s 0 0 10.35906 0 66 8.00000 10.35906 29.5% - 0s 0 0 10.35824 0 66 8.00000 10.35824 29.5% - 0s 0 0 10.35821 0 66 8.00000 10.35821 29.5% - 0s 0 2 10.35799 0 66 8.00000 10.35799 29.5% - 0s Cutting planes: Clique: 29 Zero half: 4 Explored 23 nodes (1345 simplex iterations) in 0.22 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%