Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:54:07 2012 Optimize a model with 6836 rows, 2862 columns and 23106 nonzeros Presolve removed 1221 rows and 2 columns Presolve time: 0.19s Presolved: 5615 rows, 2860 columns, 20032 nonzeros Variable types: 0 continuous, 2860 integer (2860 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 4698 iterations, 0.61 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 87 52.00000 3.00000 94.2% - 2s H 0 0 11.0000000 3.00000 72.7% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 103 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 112 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 115 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 125 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 112 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 117 4.00000 3.00000 25.0% - 13s 0 0 3.00000 0 105 4.00000 3.00000 25.0% - 14s 0 2 3.00000 0 105 4.00000 3.00000 25.0% - 17s 4 4 3.00000 1 83 4.00000 3.00000 25.0% 1219 23s 5 5 3.00000 1 119 4.00000 3.00000 25.0% 975 25s 7 6 3.00000 1 131 4.00000 3.00000 25.0% 697 34s 8 7 3.00000 1 131 4.00000 3.00000 25.0% 610 36s 10 10 3.00000 16 131 4.00000 3.00000 25.0% 7068 43s 11 11 3.00000 16 101 4.00000 3.00000 25.0% 6479 46s 14 9 3.00000 17 123 4.00000 3.00000 25.0% 5450 52s Cutting planes: Gomory: 2 Zero half: 13 Explored 20 nodes (154665 simplex iterations) in 53.28 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%