Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:35:08 2012 Optimize a model with 7974 rows, 3080 columns and 26728 nonzeros Presolve removed 40 rows and 2 columns Presolve time: 0.17s Presolved: 7934 rows, 3078 columns, 26367 nonzeros Variable types: 0 continuous, 3078 integer (3078 binary) Found heuristic solution: objective 55.0000000 Root relaxation: objective 2.333333e+00, 5205 iterations, 0.55 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.33333 0 151 55.00000 2.33333 95.8% - 5s H 0 0 54.0000000 2.33333 95.7% - 5s H 0 0 42.0000000 2.33333 94.4% - 5s H 0 0 4.0000000 2.33333 41.7% - 5s 0 0 3.00000 0 689 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 700 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 86 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 95 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 101 4.00000 3.00000 25.0% - 13s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 17s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 18s 0 2 3.00000 0 104 4.00000 3.00000 25.0% - 22s 4 4 3.00000 1 143 4.00000 3.00000 25.0% 1294 29s 5 5 3.00000 1 108 4.00000 3.00000 25.0% 1035 33s 6 6 3.00000 1 93 4.00000 3.00000 25.0% 863 37s 8 7 3.00000 1 98 4.00000 3.00000 25.0% 647 43s 9 8 3.00000 1 124 4.00000 3.00000 25.0% 575 50s 12 12 3.00000 16 101 4.00000 3.00000 25.0% 10822 62s 13 12 3.00000 16 104 4.00000 3.00000 25.0% 10111 66s Cutting planes: Gomory: 6 Zero half: 8 Explored 18 nodes (228408 simplex iterations) in 68.21 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%