Gurobi 5.0.1 (linux64) logging started Fri Nov 16 17:26:32 2012 Optimize a model with 15687 rows, 6972 columns and 53701 nonzeros Presolve removed 2075 rows and 0 columns Presolve time: 0.38s Presolved: 13612 rows, 6972 columns, 48555 nonzeros Variable types: 0 continuous, 6972 integer (6972 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 3.000000e+00, 12437 iterations, 1.94 seconds Total elapsed time = 5.14s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 149 48.00000 3.00000 93.8% - 7s H 0 0 4.0000000 3.00000 25.0% - 7s 0 0 3.00000 0 150 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 144 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 140 4.00000 3.00000 25.0% - 17s 0 0 3.00000 0 150 4.00000 3.00000 25.0% - 21s 0 0 3.00000 0 139 4.00000 3.00000 25.0% - 25s 0 0 3.00000 0 129 4.00000 3.00000 25.0% - 29s 0 0 3.00000 0 226 4.00000 3.00000 25.0% - 38s 0 0 3.00000 0 253 4.00000 3.00000 25.0% - 52s 0 0 3.00000 0 122 4.00000 3.00000 25.0% - 58s 0 2 3.00000 0 122 4.00000 3.00000 25.0% - 61s 4 4 3.00000 1 167 4.00000 3.00000 25.0% 1841 73s 5 5 3.00000 1 153 4.00000 3.00000 25.0% 1473 81s 8 7 3.00000 1 145 4.00000 3.00000 25.0% 920 90s 9 8 3.00000 1 107 4.00000 3.00000 25.0% 818 100s 12 10 3.00000 1 137 4.00000 3.00000 25.0% 614 110s 14 11 3.00000 1 93 4.00000 3.00000 25.0% 526 116s 16 12 3.00000 1 68 4.00000 3.00000 25.0% 460 121s 18 14 3.00000 1 105 4.00000 3.00000 25.0% 409 125s 22 16 3.00000 16 120 4.00000 3.00000 25.0% 14088 132s 24 18 3.00000 17 116 4.00000 3.00000 25.0% 12966 136s 29 13 infeasible 19 4.00000 3.00000 25.0% 11206 140s 34 12 infeasible 19 4.00000 3.00000 25.0% 9940 146s Cutting planes: Zero half: 11 Explored 42 nodes (591116 simplex iterations) in 149.31 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%