Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:25:21 2012 Optimize a model with 4472 rows, 1892 columns and 15136 nonzeros Presolve removed 1076 rows and 43 columns Presolve time: 0.10s Presolved: 3396 rows, 1849 columns, 12599 nonzeros Variable types: 0 continuous, 1849 integer (1849 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.000000e+00, 3055 iterations, 0.22 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 86 27.00000 3.00000 88.9% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 203 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 82 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 56 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 77 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 6s 0 2 3.00000 0 50 4.00000 3.00000 25.0% - 8s 5 5 3.00000 1 54 4.00000 3.00000 25.0% 988 10s 10 8 3.00000 1 130 4.00000 3.00000 25.0% 494 16s 13 10 3.00000 1 121 4.00000 3.00000 25.0% 380 20s Cutting planes: Gomory: 1 Clique: 1 Explored 20 nodes (145839 simplex iterations) in 23.69 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%