Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:13:26 2012 Optimize a model with 8834 rows, 3306 columns and 29524 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.20s Presolved: 8889 rows, 3304 columns, 32463 nonzeros Variable types: 0 continuous, 3304 integer (3304 binary) Found heuristic solution: objective 55.0000000 Root relaxation: objective 2.000000e+00, 2516 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 114 55.00000 2.00000 96.4% - 0s H 0 0 52.0000000 2.00000 96.2% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 203 4.00000 2.66667 33.3% - 1s 0 0 2.67485 0 2896 4.00000 2.67485 33.1% - 1s 0 0 2.67485 0 2885 4.00000 2.67485 33.1% - 2s 0 0 2.67485 0 2891 4.00000 2.67485 33.1% - 3s 0 0 2.67485 0 2643 4.00000 2.67485 33.1% - 5s 0 0 2.67485 0 2604 4.00000 2.67485 33.1% - 6s 0 0 2.67485 0 2671 4.00000 2.67485 33.1% - 7s 0 0 2.67485 0 2649 4.00000 2.67485 33.1% - 8s 0 0 2.67485 0 2605 4.00000 2.67485 33.1% - 10s 0 0 2.67485 0 2607 4.00000 2.67485 33.1% - 11s 0 0 2.67485 0 2634 4.00000 2.67485 33.1% - 12s 0 0 2.67485 0 2545 4.00000 2.67485 33.1% - 14s 0 0 2.67485 0 2641 4.00000 2.67485 33.1% - 15s 0 0 2.67485 0 2641 4.00000 2.67485 33.1% - 16s 0 1 3.00000 0 2641 4.00000 3.00000 25.0% - 19s Cutting planes: Clique: 96 Zero half: 20 Explored 12 nodes (51890 simplex iterations) in 19.87 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%