Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:27:41 2012 Optimize a model with 4256 rows, 1892 columns and 14446 nonzeros Presolve removed 948 rows and 2 columns Presolve time: 0.10s Presolved: 3308 rows, 1890 columns, 12142 nonzeros Variable types: 0 continuous, 1890 integer (1890 binary) Found heuristic solution: objective 43.0000000 Root relaxation: objective 3.000000e+00, 3082 iterations, 0.27 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 52 43.00000 3.00000 93.0% - 1s H 0 0 6.0000000 3.00000 50.0% - 1s H 0 0 5.0000000 3.00000 40.0% - 1s 0 0 3.00000 0 88 5.00000 3.00000 40.0% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 90 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 75 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 42 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 60 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 62 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 59 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 59 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 59 4.00000 3.00000 25.0% - 8s 0 2 3.00000 0 59 4.00000 3.00000 25.0% - 9s 2 3 3.00000 1 59 4.00000 3.00000 25.0% 900 10s 7 6 3.00000 1 46 4.00000 3.00000 25.0% 257 15s 11 9 3.00000 1 133 4.00000 3.00000 25.0% 164 21s 15 14 3.00000 12 66 4.00000 3.00000 25.0% 4918 25s Cutting planes: Gomory: 1 Zero half: 23 Explored 20 nodes (134874 simplex iterations) in 25.41 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%