Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:43:17 2012 Optimize a model with 4370 rows, 2162 columns and 15088 nonzeros Presolve removed 1059 rows and 46 columns Presolve time: 0.09s Presolved: 3311 rows, 2116 columns, 12650 nonzeros Variable types: 0 continuous, 2116 integer (2116 binary) Found heuristic solution: objective 34.0000000 Root relaxation: objective 3.000000e+00, 3051 iterations, 0.15 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 76 34.00000 3.00000 91.2% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 91 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 82 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 111 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 122 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 86 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 50 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 81 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 81 4.00000 3.00000 25.0% - 7s 0 2 3.00000 0 81 4.00000 3.00000 25.0% - 8s 5 5 3.00000 1 79 4.00000 3.00000 25.0% 931 10s 9 8 3.00000 1 101 4.00000 3.00000 25.0% 517 17s 13 10 3.00000 12 133 4.00000 3.00000 25.0% 4993 20s Cutting planes: Gomory: 6 Zero half: 1 Explored 20 nodes (131243 simplex iterations) in 22.64 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%