Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:29:36 2012 Optimize a model with 10903 rows, 3422 columns and 35842 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.26s Presolved: 10959 rows, 3420 columns, 38830 nonzeros Variable types: 0 continuous, 3420 integer (3420 binary) Found heuristic solution: objective 58.0000000 Root relaxation: objective 2.000000e+00, 2462 iterations, 0.09 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 116 58.00000 2.00000 96.6% - 0s H 0 0 57.0000000 2.00000 96.5% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 170 5.00000 2.66667 46.7% - 1s 0 0 2.67066 0 3125 5.00000 2.67066 46.6% - 1s 0 0 2.67066 0 3124 5.00000 2.67066 46.6% - 3s 0 0 2.67066 0 3116 5.00000 2.67066 46.6% - 3s 0 0 2.67066 0 3114 5.00000 2.67066 46.6% - 4s 0 0 2.67066 0 3111 5.00000 2.67066 46.6% - 4s 0 0 2.67066 0 3104 5.00000 2.67066 46.6% - 5s 0 0 2.67066 0 3104 5.00000 2.67066 46.6% - 6s 0 0 2.67066 0 2677 5.00000 2.67066 46.6% - 8s 0 0 2.67066 0 2784 5.00000 2.67066 46.6% - 9s 0 0 2.67066 0 2743 5.00000 2.67066 46.6% - 10s 0 0 2.67066 0 2722 5.00000 2.67066 46.6% - 11s 0 0 2.67066 0 2707 5.00000 2.67066 46.6% - 12s 0 0 2.67066 0 2775 5.00000 2.67066 46.6% - 13s 0 0 2.67066 0 2762 5.00000 2.67066 46.6% - 14s 0 0 2.67066 0 2789 5.00000 2.67066 46.6% - 16s 0 0 2.67066 0 2739 5.00000 2.67066 46.6% - 17s 0 0 2.67066 0 2748 5.00000 2.67066 46.6% - 18s 0 0 2.67066 0 2748 5.00000 2.67066 46.6% - 19s 0 2 2.80000 0 2748 5.00000 2.80000 44.0% - 25s * 34 3 22 4.0000000 4.00000 0.0% 483 28s Cutting planes: Clique: 87 Zero half: 4 Explored 35 nodes (64605 simplex iterations) in 28.66 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%