Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:43:03 2012 Optimize a model with 4508 rows, 2162 columns and 15502 nonzeros Presolve removed 1105 rows and 46 columns Presolve time: 0.09s Presolved: 3403 rows, 2116 columns, 12880 nonzeros Variable types: 0 continuous, 2116 integer (2116 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.000000e+00, 3210 iterations, 0.23 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 97 27.00000 3.00000 88.9% - 0s H 0 0 5.0000000 3.00000 40.0% - 0s 0 0 3.00000 0 70 5.00000 3.00000 40.0% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 263 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 115 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 121 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 87 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 90 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 83 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 105 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 79 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 100 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 60 4.00000 3.00000 25.0% - 11s 0 2 3.00000 0 58 4.00000 3.00000 25.0% - 12s Explored 3 nodes (112239 simplex iterations) in 13.39 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%