Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:03:16 2012 Optimize a model with 11699 rows, 3660 columns and 38458 nonzeros Presolve removed 3 rows and 62 columns Presolve time: 0.30s Presolved: 11696 rows, 3598 columns, 38008 nonzeros Variable types: 0 continuous, 3598 integer (3598 binary) Found heuristic solution: objective 60.0000000 Root relaxation: objective 2.000000e+00, 2654 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 0 118 60.00000 2.00000 96.7% - 0s H 0 0 59.0000000 2.00000 96.6% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 2914 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 1677 5.00000 2.66667 46.7% - 2s 0 0 2.66667 0 1136 5.00000 2.66667 46.7% - 2s 0 0 2.66667 0 158 5.00000 2.66667 46.7% - 2s 0 0 2.67052 0 3176 5.00000 2.67052 46.6% - 3s 0 0 2.67052 0 3178 5.00000 2.67052 46.6% - 4s 0 0 2.67052 0 2969 5.00000 2.67052 46.6% - 5s 0 0 2.67052 0 2895 5.00000 2.67052 46.6% - 6s 0 0 2.67052 0 2892 5.00000 2.67052 46.6% - 6s 0 0 2.67052 0 2918 5.00000 2.67052 46.6% - 7s 0 0 2.67052 0 2825 5.00000 2.67052 46.6% - 8s 0 0 2.67052 0 2920 5.00000 2.67052 46.6% - 9s 0 0 2.67052 0 2871 5.00000 2.67052 46.6% - 11s 0 0 2.67052 0 2854 5.00000 2.67052 46.6% - 12s 0 0 2.67052 0 2857 5.00000 2.67052 46.6% - 12s 0 0 2.67052 0 2838 5.00000 2.67052 46.6% - 14s 0 0 2.67052 0 2944 5.00000 2.67052 46.6% - 15s 0 0 2.67052 0 2931 5.00000 2.67052 46.6% - 15s 0 2 2.80000 0 2931 5.00000 2.80000 44.0% - 19s 2 4 3.00000 2 138 5.00000 3.00000 40.0% 932 20s H 27 4 4.0000000 3.00000 25.0% 272 21s Cutting planes: Clique: 85 Zero half: 3 Explored 32 nodes (47203 simplex iterations) in 21.21 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%