Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:39:12 2012 Optimize a model with 15231 rows, 4692 columns and 50046 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.49s Presolved: 15297 rows, 4690 columns, 54222 nonzeros Variable types: 0 continuous, 4690 integer (4690 binary) Found heuristic solution: objective 68.0000000 Root relaxation: objective 2.000000e+00, 3310 iterations, 0.11 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 67.0000000 2.00000 97.0% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 3526 5.00000 2.66667 46.7% - 7s 0 0 2.66667 0 2415 5.00000 2.66667 46.7% - 8s 0 0 2.66667 0 2411 5.00000 2.66667 46.7% - 9s 0 0 2.66667 0 1299 5.00000 2.66667 46.7% - 9s 0 0 2.66667 0 2574 5.00000 2.66667 46.7% - 10s 0 0 2.66667 0 179 5.00000 2.66667 46.7% - 12s 0 0 2.67005 0 3724 5.00000 2.67005 46.6% - 13s 0 0 2.67005 0 3719 5.00000 2.67005 46.6% - 14s 0 0 2.67005 0 3727 5.00000 2.67005 46.6% - 15s 0 0 2.67005 0 3664 5.00000 2.67005 46.6% - 16s 0 0 2.67005 0 3656 5.00000 2.67005 46.6% - 18s 0 0 2.67005 0 3664 5.00000 2.67005 46.6% - 19s 0 0 2.67005 0 3664 5.00000 2.67005 46.6% - 20s 0 0 2.67005 0 3664 5.00000 2.67005 46.6% - 21s 0 0 2.67005 0 3666 5.00000 2.67005 46.6% - 23s 0 0 2.67005 0 3666 5.00000 2.67005 46.6% - 23s 0 2 2.80000 0 3666 5.00000 2.80000 44.0% - 46s H 27 5 4.0000000 3.00000 25.0% 269 47s Cutting planes: Clique: 129 Zero half: 6 Explored 33 nodes (55857 simplex iterations) in 47.90 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%