Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:10:20 2012 Optimize a model with 5879 rows, 2450 columns and 19843 nonzeros Presolve removed 1227 rows and 2 columns Presolve time: 0.14s Presolved: 4652 rows, 2448 columns, 16713 nonzeros Variable types: 0 continuous, 2448 integer (2448 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 3.000000e+00, 3970 iterations, 0.41 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 54 49.00000 3.00000 93.9% - 2s H 0 0 20.0000000 3.00000 85.0% - 2s H 0 0 5.0000000 3.00000 40.0% - 2s 0 0 3.00000 0 59 5.00000 3.00000 40.0% - 2s 0 0 3.00000 0 79 5.00000 3.00000 40.0% - 4s H 0 0 4.0000000 3.00000 25.0% - 4s 0 0 3.00000 0 91 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 75 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 8s 0 2 3.00000 0 106 4.00000 3.00000 25.0% - 11s 4 4 3.00000 1 52 4.00000 3.00000 25.0% 1821 15s 6 6 3.00000 1 99 4.00000 3.00000 25.0% 1214 21s 7 6 3.00000 1 101 4.00000 3.00000 25.0% 1040 25s 10 10 3.00000 15 86 4.00000 3.00000 25.0% 6880 30s 18 10 3.00000 18 80 4.00000 3.00000 25.0% 4047 35s Cutting planes: Gomory: 4 Zero half: 9 Explored 36 nodes (138076 simplex iterations) in 35.71 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%