Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:54:39 2012 Optimize a model with 5827 rows, 2256 columns and 19503 nonzeros Presolve removed 1271 rows and 2 columns Presolve time: 0.14s Presolved: 4556 rows, 2254 columns, 16442 nonzeros Variable types: 0 continuous, 2254 integer (2254 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 3.000000e+00, 3834 iterations, 0.42 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 121 47.00000 3.00000 93.6% - 1s H 0 0 30.0000000 3.00000 90.0% - 1s H 0 0 14.0000000 3.00000 78.6% - 1s H 0 0 5.0000000 3.00000 40.0% - 1s 0 0 3.00000 0 150 5.00000 3.00000 40.0% - 1s 0 0 3.00000 0 78 5.00000 3.00000 40.0% - 4s H 0 0 4.0000000 3.00000 25.0% - 5s 0 0 3.00000 0 70 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 100 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 108 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 110 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 140 4.00000 3.00000 25.0% - 17s 0 0 3.00000 0 140 4.00000 3.00000 25.0% - 17s 0 2 3.00000 0 140 4.00000 3.00000 25.0% - 20s 5 5 3.00000 1 68 4.00000 3.00000 25.0% 786 26s 7 6 3.00000 1 112 4.00000 3.00000 25.0% 561 30s Cutting planes: Gomory: 8 Zero half: 73 Explored 8 nodes (145813 simplex iterations) in 31.59 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%