Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:18:22 2012 Optimize a model with 3731 rows, 1722 columns and 12751 nonzeros Presolve removed 1026 rows and 41 columns Presolve time: 0.08s Presolved: 2705 rows, 1681 columns, 10291 nonzeros Variable types: 0 continuous, 1681 integer (1681 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.000000e+00, 3205 iterations, 0.25 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 73 27.00000 3.00000 88.9% - 0s H 0 0 5.0000000 3.00000 40.0% - 0s 0 0 3.00000 0 151 5.00000 3.00000 40.0% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 69 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 99 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 69 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 77 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 75 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 112 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 102 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 86 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 7s 0 2 3.00000 0 40 4.00000 3.00000 25.0% - 7s 7 6 3.00000 1 44 4.00000 3.00000 25.0% 104 10s 13 10 3.00000 1 81 4.00000 3.00000 25.0% 55.8 15s Cutting planes: Gomory: 3 Zero half: 1 Explored 18 nodes (132716 simplex iterations) in 16.27 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%