Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:41:24 2012 Optimize a model with 6499 rows, 2756 columns and 21994 nonzeros Presolve removed 1198 rows and 2 columns Presolve time: 0.16s Presolved: 5353 rows, 2754 columns, 21686 nonzeros Variable types: 0 continuous, 2754 integer (2754 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 4336 iterations, 0.53 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 1252 52.00000 3.00000 94.2% - 2s H 0 0 44.0000000 3.00000 93.2% - 2s H 0 0 20.0000000 3.00000 85.0% - 2s 0 0 3.00000 0 115 20.00000 3.00000 85.0% - 3s H 0 0 15.0000000 3.00000 80.0% - 3s H 0 0 5.0000000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 96 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 95 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 88 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 121 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 125 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 118 4.00000 3.00000 25.0% - 17s 0 0 3.00000 0 129 4.00000 3.00000 25.0% - 19s 0 0 3.00000 0 105 4.00000 3.00000 25.0% - 21s 0 2 3.00000 0 105 4.00000 3.00000 25.0% - 24s 2 3 3.00000 1 105 4.00000 3.00000 25.0% 2819 25s 4 4 3.00000 1 68 4.00000 3.00000 25.0% 1410 30s 6 6 3.00000 1 108 4.00000 3.00000 25.0% 940 36s 7 6 3.00000 1 110 4.00000 3.00000 25.0% 805 40s 10 10 3.00000 14 86 4.00000 3.00000 25.0% 8156 49s 13 8 3.00000 15 86 4.00000 3.00000 25.0% 6518 51s Cutting planes: Gomory: 5 Zero half: 9 Explored 16 nodes (188357 simplex iterations) in 51.72 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%