Gurobi 5.0.1 (linux64) logging started Fri Nov 16 08:35:31 2012 Optimize a model with 12415 rows, 4160 columns and 41086 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.37s Presolved: 12413 rows, 4158 columns, 40698 nonzeros Variable types: 0 continuous, 4158 integer (4158 binary) Found heuristic solution: objective 62.0000000 Root relaxation: objective 2.000000e+00, 3091 iterations, 0.11 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 128 62.00000 2.00000 96.8% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 3307 5.00000 2.66667 46.7% - 2s 0 0 2.66667 0 3308 5.00000 2.66667 46.7% - 3s 0 0 2.66667 0 148 5.00000 2.66667 46.7% - 5s H 0 0 4.0000000 2.66667 33.3% - 5s 0 0 2.67027 0 3162 4.00000 2.67027 33.2% - 8s 0 0 2.67027 0 3202 4.00000 2.67027 33.2% - 8s 0 0 2.67027 0 3131 4.00000 2.67027 33.2% - 10s 0 0 2.67027 0 2962 4.00000 2.67027 33.2% - 12s 0 0 2.67027 0 3024 4.00000 2.67027 33.2% - 13s 0 0 2.67027 0 3020 4.00000 2.67027 33.2% - 14s 0 0 2.67027 0 3106 4.00000 2.67027 33.2% - 16s 0 0 2.67027 0 3026 4.00000 2.67027 33.2% - 17s 0 0 2.67027 0 2974 4.00000 2.67027 33.2% - 18s 0 0 2.67027 0 3062 4.00000 2.67027 33.2% - 19s 0 0 2.67027 0 3027 4.00000 2.67027 33.2% - 21s 0 0 2.67027 0 3017 4.00000 2.67027 33.2% - 22s 0 0 2.67027 0 2955 4.00000 2.67027 33.2% - 23s 0 0 2.67027 0 3086 4.00000 2.67027 33.2% - 24s 0 0 2.67027 0 3086 4.00000 2.67027 33.2% - 25s 0 2 2.80000 0 3086 4.00000 2.80000 30.0% - 30s Cutting planes: Clique: 75 Zero half: 21 Explored 17 nodes (74259 simplex iterations) in 31.16 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%