Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:03:39 2012 Optimize a model with 10259 rows, 3660 columns and 34138 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.26s Presolved: 10257 rows, 3658 columns, 33796 nonzeros Variable types: 0 continuous, 3658 integer (3658 binary) Found heuristic solution: objective 60.0000000 Root relaxation: objective 2.000000e+00, 2768 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 0 120 60.00000 2.00000 96.7% - 0s H 0 0 55.0000000 2.00000 96.4% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 793 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 3069 5.00000 2.66667 46.7% - 1s H 0 0 4.0000000 2.66667 33.3% - 2s 0 0 2.67836 0 2688 4.00000 2.67836 33.0% - 4s 0 0 2.67836 0 2724 4.00000 2.67836 33.0% - 5s 0 0 2.67836 0 2670 4.00000 2.67836 33.0% - 6s 0 0 2.67836 0 2646 4.00000 2.67836 33.0% - 7s 0 0 2.67836 0 2562 4.00000 2.67836 33.0% - 7s 0 0 2.67836 0 2594 4.00000 2.67836 33.0% - 8s 0 0 2.67836 0 2605 4.00000 2.67836 33.0% - 9s 0 0 2.67836 0 2617 4.00000 2.67836 33.0% - 10s 0 0 2.67836 0 2617 4.00000 2.67836 33.0% - 11s 0 1 3.00000 0 2617 4.00000 3.00000 25.0% - 14s 7 6 3.00000 6 100 4.00000 3.00000 25.0% 386 15s Cutting planes: Clique: 115 Zero half: 35 Explored 28 nodes (39973 simplex iterations) in 15.43 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%