Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:06:54 2012 Optimize a model with 12239 rows, 3660 columns and 40078 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.32s Presolved: 12297 rows, 3658 columns, 43270 nonzeros Variable types: 0 continuous, 3658 integer (3658 binary) Found heuristic solution: objective 60.0000000 Root relaxation: objective 2.000000e+00, 2709 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 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 2261 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 1080 5.00000 2.66667 46.7% - 2s H 0 0 4.0000000 2.66667 33.3% - 2s 0 0 2.66667 0 3331 4.00000 2.66667 33.3% - 3s 0 0 2.67052 0 3064 4.00000 2.67052 33.2% - 7s 0 0 2.67052 0 3067 4.00000 2.67052 33.2% - 7s 0 0 2.67052 0 2935 4.00000 2.67052 33.2% - 9s 0 0 2.67052 0 3088 4.00000 2.67052 33.2% - 11s 0 0 2.67052 0 3060 4.00000 2.67052 33.2% - 14s 0 0 2.67052 0 3007 4.00000 2.67052 33.2% - 16s 0 0 2.67052 0 3019 4.00000 2.67052 33.2% - 18s 0 0 2.67052 0 2983 4.00000 2.67052 33.2% - 21s 0 0 2.67052 0 3046 4.00000 2.67052 33.2% - 23s 0 0 2.67052 0 2969 4.00000 2.67052 33.2% - 26s 0 0 2.67052 0 3091 4.00000 2.67052 33.2% - 28s 0 0 2.67052 0 3015 4.00000 2.67052 33.2% - 30s 0 2 2.80000 0 3015 4.00000 2.80000 30.0% - 36s Cutting planes: Clique: 75 Zero half: 5 Explored 11 nodes (86162 simplex iterations) in 38.38 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%