Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:44:59 2012 Optimize a model with 1710 rows, 83 columns and 3420 nonzeros Presolve removed 1174 rows and 0 columns Presolve time: 0.04s Presolved: 536 rows, 83 columns, 3541 nonzeros Variable types: 0 continuous, 83 integer (83 binary) Found heuristic solution: objective 7.0000000 Root relaxation: objective 1.253115e+01, 278 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 12.53115 0 76 7.00000 12.53115 79.0% - 0s H 0 0 8.0000000 12.53115 56.6% - 0s 0 0 12.14023 0 81 8.00000 12.14023 51.8% - 0s 0 0 12.08336 0 80 8.00000 12.08336 51.0% - 0s 0 0 12.05457 0 81 8.00000 12.05457 50.7% - 0s H 0 0 9.0000000 12.05457 33.9% - 0s 0 0 12.03189 0 81 9.00000 12.03189 33.7% - 0s 0 0 12.02689 0 81 9.00000 12.02689 33.6% - 0s 0 0 11.98520 0 81 9.00000 11.98520 33.2% - 0s 0 0 11.95296 0 82 9.00000 11.95296 32.8% - 0s 0 0 11.94935 0 82 9.00000 11.94935 32.8% - 0s 0 0 11.94884 0 81 9.00000 11.94884 32.8% - 0s 0 2 11.94517 0 81 9.00000 11.94517 32.7% - 0s Cutting planes: Clique: 47 Zero half: 3 Explored 35 nodes (3045 simplex iterations) in 0.69 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 9.000000000000e+00, best bound 9.000000000000e+00, gap 0.0%