Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:20:57 2012 Optimize a model with 4200 rows, 1806 columns and 14238 nonzeros Presolve removed 1134 rows and 0 columns Presolve time: 0.08s Presolved: 3066 rows, 1806 columns, 11550 nonzeros Variable types: 0 continuous, 1806 integer (1806 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.000000e+00, 2882 iterations, 0.19 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 58 27.00000 3.00000 88.9% - 0s H 0 0 5.0000000 3.00000 40.0% - 0s 0 0 3.00000 0 117 5.00000 3.00000 40.0% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 87 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 99 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 126 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 64 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 126 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 123 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 119 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 149 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 85 4.00000 3.00000 25.0% - 7s 0 2 3.00000 0 85 4.00000 3.00000 25.0% - 8s 5 5 3.00000 1 40 4.00000 3.00000 25.0% 549 10s 11 9 3.00000 1 131 4.00000 3.00000 25.0% 249 17s 16 12 3.00000 14 77 4.00000 3.00000 25.0% 3997 20s Cutting planes: Gomory: 3 Zero half: 22 Explored 22 nodes (128230 simplex iterations) in 21.81 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%