Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:17:04 2012 Optimize a model with 3479 rows, 1640 columns and 11878 nonzeros Presolve removed 602 rows and 2 columns Presolve time: 0.11s Presolved: 2917 rows, 1638 columns, 11974 nonzeros Variable types: 0 continuous, 1638 integer (1638 binary) Found heuristic solution: objective 40.0000000 Root relaxation: objective 3.000000e+00, 2682 iterations, 0.21 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 38 40.00000 3.00000 92.5% - 0s H 0 0 8.0000000 3.00000 62.5% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 420 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 84 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 43 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 61 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 59 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 102 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 75 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 85 4.00000 3.00000 25.0% - 5s 0 2 3.00000 0 85 4.00000 3.00000 25.0% - 6s 6 6 3.00000 1 78 4.00000 3.00000 25.0% 493 10s 13 11 3.00000 15 161 4.00000 3.00000 25.0% 4013 17s Cutting planes: Gomory: 5 Zero half: 6 Explored 20 nodes (103270 simplex iterations) in 19.18 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%