Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:33:02 2012 Optimize a model with 15231 rows, 4692 columns and 50046 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.50s Presolved: 15229 rows, 4690 columns, 49598 nonzeros Variable types: 0 continuous, 4690 integer (4690 binary) Found heuristic solution: objective 68.0000000 Root relaxation: objective 2.000000e+00, 3293 iterations, 0.12 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 136 68.00000 2.00000 97.1% - 0s H 0 0 60.0000000 2.00000 96.7% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 199 5.00000 2.66667 46.7% - 6s 0 0 2.67005 0 4192 5.00000 2.67005 46.6% - 7s 0 0 2.67005 0 4176 5.00000 2.67005 46.6% - 9s 0 0 2.67005 0 4157 5.00000 2.67005 46.6% - 9s 0 0 2.67005 0 4129 5.00000 2.67005 46.6% - 10s 0 0 2.67005 0 4129 5.00000 2.67005 46.6% - 11s 0 0 2.67005 0 3759 5.00000 2.67005 46.6% - 13s 0 0 2.67005 0 3685 5.00000 2.67005 46.6% - 14s 0 0 2.67005 0 3687 5.00000 2.67005 46.6% - 15s 0 0 2.67005 0 3687 5.00000 2.67005 46.6% - 16s 0 0 2.67005 0 3695 5.00000 2.67005 46.6% - 17s 0 0 2.67005 0 3656 5.00000 2.67005 46.6% - 18s 0 0 2.67005 0 3691 5.00000 2.67005 46.6% - 20s 0 0 2.67005 0 3691 5.00000 2.67005 46.6% - 20s 0 2 2.80000 0 3691 5.00000 2.80000 44.0% - 33s 18 16 4.00000 14 106 5.00000 3.00000 40.0% 365 35s H 27 4 4.0000000 3.00000 25.0% 259 35s Cutting planes: Clique: 105 Zero half: 2 Explored 32 nodes (61856 simplex iterations) in 36.87 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%