Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:26:42 2012 Optimize a model with 9453 rows, 3422 columns and 31492 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.22s Presolved: 9451 rows, 3420 columns, 31166 nonzeros Variable types: 0 continuous, 3420 integer (3420 binary) Found heuristic solution: objective 57.0000000 Root relaxation: objective 2.000000e+00, 2445 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 116 57.00000 2.00000 96.5% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 297 5.00000 2.66667 46.7% - 1s 0 0 2.68293 0 2700 5.00000 2.68293 46.3% - 1s 0 0 2.68293 0 2730 5.00000 2.68293 46.3% - 2s 0 0 2.68293 0 2422 5.00000 2.68293 46.3% - 7s 0 0 2.68293 0 2541 5.00000 2.68293 46.3% - 10s 0 0 2.68293 0 2454 5.00000 2.68293 46.3% - 14s 0 0 2.68293 0 2556 5.00000 2.68293 46.3% - 17s 0 0 2.68293 0 2540 5.00000 2.68293 46.3% - 20s 0 0 2.68293 0 2540 5.00000 2.68293 46.3% - 23s 0 0 2.68293 0 2527 5.00000 2.68293 46.3% - 27s 0 0 2.68293 0 2645 5.00000 2.68293 46.3% - 30s 0 0 2.68293 0 2645 5.00000 2.68293 46.3% - 32s 0 2 3.00000 0 2641 5.00000 3.00000 40.0% - 39s 2 4 3.00000 2 204 5.00000 3.00000 40.0% 4492 40s H 27 3 4.0000000 3.66667 8.33% 523 40s Cutting planes: Clique: 92 Zero half: 15 Explored 27 nodes (131444 simplex iterations) in 40.64 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%