Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:42:09 2012 Optimize a model with 4814 rows, 2070 columns and 16288 nonzeros Presolve removed 812 rows and 2 columns Presolve time: 0.11s Presolved: 4047 rows, 2068 columns, 16155 nonzeros Variable types: 0 continuous, 2068 integer (2068 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 3.000000e+00, 3474 iterations, 0.32 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 77 45.00000 3.00000 93.3% - 2s H 0 0 29.0000000 3.00000 89.7% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 99 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 89 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 132 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 78 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 76 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 89 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 91 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 97 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 97 4.00000 3.00000 25.0% - 13s 0 2 3.00000 0 80 4.00000 3.00000 25.0% - 14s 2 3 3.00000 1 97 4.00000 3.00000 25.0% 838 15s 14 12 3.00000 16 86 4.00000 3.00000 25.0% 3071 20s Cutting planes: Gomory: 2 Clique: 1 Zero half: 6 Explored 32 nodes (138516 simplex iterations) in 20.69 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%