Gurobi 5.0.1 (linux64) logging started Fri Nov 16 17:29:01 2012 Optimize a model with 15521 rows, 6972 columns and 53203 nonzeros Presolve removed 1826 rows and 0 columns Presolve time: 0.36s Presolved: 13695 rows, 6972 columns, 48804 nonzeros Variable types: 0 continuous, 6972 integer (6972 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 3.000000e+00, 12108 iterations, 2.40 seconds Total elapsed time = 5.32s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 117 51.00000 3.00000 94.1% - 6s H 0 0 4.0000000 3.00000 25.0% - 6s 0 0 3.00000 0 262 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 159 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 131 4.00000 3.00000 25.0% - 17s 0 0 3.00000 0 117 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 19s 0 0 3.00000 0 122 4.00000 3.00000 25.0% - 21s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 22s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 26s 0 0 3.00000 0 108 4.00000 3.00000 25.0% - 30s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 31s 0 0 3.00000 0 118 4.00000 3.00000 25.0% - 35s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 38s 0 0 3.00000 0 125 4.00000 3.00000 25.0% - 41s 0 0 3.00000 0 125 4.00000 3.00000 25.0% - 42s 0 2 3.00000 0 125 4.00000 3.00000 25.0% - 46s 4 4 3.00000 1 74 4.00000 3.00000 25.0% 3043 58s 5 5 3.00000 1 120 4.00000 3.00000 25.0% 2434 66s 6 6 3.00000 1 140 4.00000 3.00000 25.0% 2029 74s 7 6 3.00000 1 153 4.00000 3.00000 25.0% 1739 78s 8 7 3.00000 1 153 4.00000 3.00000 25.0% 1522 88s 9 8 3.00000 1 144 4.00000 3.00000 25.0% 1352 97s 10 8 3.00000 1 135 4.00000 3.00000 25.0% 1217 103s 11 9 3.00000 1 88 4.00000 3.00000 25.0% 1107 107s 12 10 3.00000 1 120 4.00000 3.00000 25.0% 1014 111s 15 12 infeasible 13 4.00000 3.00000 25.0% 17903 116s 21 10 infeasible 16 4.00000 3.00000 25.0% 13201 121s Cutting planes: Zero half: 6 Explored 25 nodes (521479 simplex iterations) in 124.13 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%