Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:37:54 2012 Optimize a model with 15299 rows, 4692 columns and 50250 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.49s Presolved: 15365 rows, 4690 columns, 54424 nonzeros Variable types: 0 continuous, 4690 integer (4690 binary) Found heuristic solution: objective 68.0000000 Root relaxation: objective 2.000000e+00, 3624 iterations, 0.13 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 64.0000000 2.00000 96.9% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 698 4.00000 2.66667 33.3% - 6s 0 0 2.66667 0 2635 4.00000 2.66667 33.3% - 6s 0 0 2.67692 0 3755 4.00000 2.67692 33.1% - 12s 0 0 2.67692 0 3748 4.00000 2.67692 33.1% - 14s 0 0 2.67692 0 3746 4.00000 2.67692 33.1% - 14s 0 0 2.67692 0 3745 4.00000 2.67692 33.1% - 15s 0 0 2.67692 0 3740 4.00000 2.67692 33.1% - 16s 0 0 2.67692 0 3747 4.00000 2.67692 33.1% - 17s 0 0 2.67692 0 3736 4.00000 2.67692 33.1% - 18s 0 0 2.67692 0 3733 4.00000 2.67692 33.1% - 20s 0 0 2.67692 0 3731 4.00000 2.67692 33.1% - 22s 0 0 2.67692 0 3731 4.00000 2.67692 33.1% - 24s 0 1 3.00000 0 3731 4.00000 3.00000 25.0% - 38s Cutting planes: Clique: 188 Zero half: 4 Explored 10 nodes (53129 simplex iterations) in 38.73 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%