Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:45:22 2012 Optimize a model with 11091 rows, 3540 columns and 36519 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.27s Presolved: 11148 rows, 3538 columns, 39624 nonzeros Variable types: 0 continuous, 3538 integer (3538 binary) Found heuristic solution: objective 59.0000000 Root relaxation: objective 2.000000e+00, 2587 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 55.0000000 2.00000 96.4% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 502 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 279 5.00000 2.66667 46.7% - 2s H 0 0 4.0000000 2.66667 33.3% - 2s 0 0 2.67857 0 3207 4.00000 2.67857 33.0% - 3s 0 0 2.67857 0 3224 4.00000 2.67857 33.0% - 4s 0 0 2.67857 0 3104 4.00000 2.67857 33.0% - 6s 0 0 2.67857 0 3044 4.00000 2.67857 33.0% - 7s 0 0 2.67857 0 2973 4.00000 2.67857 33.0% - 8s 0 0 2.67857 0 2977 4.00000 2.67857 33.0% - 10s 0 0 2.67857 0 2972 4.00000 2.67857 33.0% - 11s 0 0 2.67857 0 2981 4.00000 2.67857 33.0% - 12s 0 0 2.67857 0 2957 4.00000 2.67857 33.0% - 13s 0 0 2.67857 0 2940 4.00000 2.67857 33.0% - 14s 0 0 2.67857 0 2899 4.00000 2.67857 33.0% - 16s 0 0 2.67857 0 2891 4.00000 2.67857 33.0% - 16s 0 0 2.67857 0 2897 4.00000 2.67857 33.0% - 17s 0 0 2.67857 0 2897 4.00000 2.67857 33.0% - 18s 0 1 3.00000 0 2897 4.00000 3.00000 25.0% - 21s Cutting planes: Clique: 163 Zero half: 7 Explored 4 nodes (45078 simplex iterations) in 22.00 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%