Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:41:42 2012 Optimize a model with 15911 rows, 4692 columns and 52086 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.51s Presolved: 15977 rows, 4690 columns, 56242 nonzeros Variable types: 0 continuous, 4690 integer (4690 binary) Found heuristic solution: objective 68.0000000 Root relaxation: objective 2.000000e+00, 3469 iterations, 0.16 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 65.0000000 2.00000 96.9% - 0s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 502 5.00000 2.66667 46.7% - 4s 0 0 2.67005 0 4148 5.00000 2.67005 46.6% - 5s 0 0 2.67005 0 4153 5.00000 2.67005 46.6% - 6s 0 0 2.67005 0 3764 5.00000 2.67005 46.6% - 12s 0 0 2.67005 0 3803 5.00000 2.67005 46.6% - 15s 0 0 2.67005 0 3830 5.00000 2.67005 46.6% - 18s 0 0 2.67005 0 3765 5.00000 2.67005 46.6% - 23s 0 0 2.67005 0 3718 5.00000 2.67005 46.6% - 28s 0 0 2.67005 0 3714 5.00000 2.67005 46.6% - 32s 0 0 2.67005 0 3693 5.00000 2.67005 46.6% - 37s 0 0 2.67005 0 3826 5.00000 2.67005 46.6% - 42s 0 0 2.67005 0 3864 5.00000 2.67005 46.6% - 46s 0 0 2.67005 0 3864 5.00000 2.67005 46.6% - 49s 0 2 2.80000 0 3864 5.00000 2.80000 44.0% - 62s * 32 4 25 4.0000000 3.00000 25.0% 510 64s 36 0 cutoff 1 4.00000 4.00000 0.0% 594 66s Cutting planes: Clique: 89 Zero half: 10 Explored 37 nodes (167411 simplex iterations) in 66.10 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%