Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:46:13 2012 Optimize a model with 6187 rows, 2756 columns and 21058 nonzeros Presolve removed 1042 rows and 2 columns Presolve time: 0.16s Presolved: 5197 rows, 2754 columns, 21172 nonzeros Variable types: 0 continuous, 2754 integer (2754 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 4241 iterations, 0.50 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 809 52.00000 3.00000 94.2% - 2s H 0 0 25.0000000 3.00000 88.0% - 2s H 0 0 19.0000000 3.00000 84.2% - 2s 0 0 3.00000 0 117 19.00000 3.00000 84.2% - 2s H 0 0 5.0000000 3.00000 40.0% - 3s 0 0 3.00000 0 124 5.00000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 70 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 62 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 64 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 64 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 62 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 81 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 98 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 89 4.00000 3.00000 25.0% - 12s 0 2 3.00000 0 89 4.00000 3.00000 25.0% - 13s 4 4 3.00000 1 75 4.00000 3.00000 25.0% 557 17s 6 6 3.00000 1 98 4.00000 3.00000 25.0% 372 20s 8 7 3.00000 1 93 4.00000 3.00000 25.0% 279 26s 10 8 3.00000 1 74 4.00000 3.00000 25.0% 223 32s 11 9 3.00000 1 85 4.00000 3.00000 25.0% 203 37s Cutting planes: Gomory: 4 Zero half: 14 Explored 16 nodes (176846 simplex iterations) in 39.79 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%