Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:43:41 2012 Optimize a model with 10560 rows, 3540 columns and 34926 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.26s Presolved: 10558 rows, 3538 columns, 34568 nonzeros Variable types: 0 continuous, 3538 integer (3538 binary) Found heuristic solution: objective 59.0000000 Root relaxation: objective 2.000000e+00, 2510 iterations, 0.08 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 118 59.00000 2.00000 96.6% - 0s H 0 0 56.0000000 2.00000 96.4% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 2962 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 884 5.00000 2.66667 46.7% - 2s 0 0 2.66667 0 2880 5.00000 2.66667 46.7% - 3s H 0 0 4.0000000 2.66667 33.3% - 3s 0 0 2.66667 0 139 4.00000 2.66667 33.3% - 6s 0 0 2.67059 0 2688 4.00000 2.67059 33.2% - 8s 0 0 2.67059 0 2753 4.00000 2.67059 33.2% - 9s 0 0 2.67059 0 2821 4.00000 2.67059 33.2% - 11s 0 0 2.67059 0 2723 4.00000 2.67059 33.2% - 14s 0 0 2.67059 0 2717 4.00000 2.67059 33.2% - 15s 0 0 2.67059 0 2774 4.00000 2.67059 33.2% - 17s 0 0 2.67059 0 2803 4.00000 2.67059 33.2% - 19s 0 0 2.67059 0 2756 4.00000 2.67059 33.2% - 22s 0 0 2.67059 0 2734 4.00000 2.67059 33.2% - 24s 0 0 2.67059 0 2737 4.00000 2.67059 33.2% - 26s 0 0 2.67059 0 2737 4.00000 2.67059 33.2% - 28s 0 2 2.80000 0 2737 4.00000 2.80000 30.0% - 36s Cutting planes: Clique: 56 Zero half: 9 Explored 15 nodes (102130 simplex iterations) in 39.34 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%