Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:57:18 2012 Optimize a model with 6192 rows, 2352 columns and 20736 nonzeros Presolve removed 1824 rows and 0 columns Presolve time: 0.14s Presolved: 4368 rows, 2352 columns, 16512 nonzeros Variable types: 0 continuous, 2352 integer (2352 binary) Found heuristic solution: objective 31.0000000 Root relaxation: objective 3.000000e+00, 5299 iterations, 0.60 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 62 31.00000 3.00000 90.3% - 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 0 214 5.00000 3.00000 40.0% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 154 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 144 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 151 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 159 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 141 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 126 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 22s 0 0 3.00000 0 134 4.00000 3.00000 25.0% - 24s 0 0 3.00000 0 134 4.00000 3.00000 25.0% - 25s 0 2 3.00000 0 134 4.00000 3.00000 25.0% - 27s 5 5 3.00000 1 147 4.00000 3.00000 25.0% 855 33s 6 6 3.00000 1 154 4.00000 3.00000 25.0% 712 35s 8 7 3.00000 1 80 4.00000 3.00000 25.0% 534 40s 10 8 3.00000 1 173 4.00000 3.00000 25.0% 427 46s 13 10 infeasible 13 4.00000 3.00000 25.0% 7346 51s 16 10 3.00000 14 195 4.00000 3.00000 25.0% 6085 58s 18 10 3.00000 15 112 4.00000 3.00000 25.0% 5485 60s Cutting planes: Gomory: 4 Zero half: 8 Explored 21 nodes (240867 simplex iterations) in 61.15 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%