Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:56:05 2012 Optimize a model with 8791 rows, 3192 columns and 29286 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.19s Presolved: 8845 rows, 3190 columns, 32108 nonzeros Variable types: 0 continuous, 3190 integer (3190 binary) Found heuristic solution: objective 56.0000000 Root relaxation: objective 2.000000e+00, 2370 iterations, 0.06 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 110 56.00000 2.00000 96.4% - 0s H 0 0 54.0000000 2.00000 96.3% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 159 5.00000 2.66667 46.7% - 1s 0 0 2.67081 0 2817 5.00000 2.67081 46.6% - 1s 0 0 2.67081 0 2817 5.00000 2.67081 46.6% - 2s 0 0 2.67081 0 2619 5.00000 2.67081 46.6% - 3s 0 0 2.67081 0 2564 5.00000 2.67081 46.6% - 5s 0 0 2.67081 0 2587 5.00000 2.67081 46.6% - 6s 0 0 2.67081 0 2572 5.00000 2.67081 46.6% - 7s 0 0 2.67081 0 2565 5.00000 2.67081 46.6% - 8s 0 0 2.67081 0 2591 5.00000 2.67081 46.6% - 9s 0 0 2.67081 0 2580 5.00000 2.67081 46.6% - 10s 0 0 2.67081 0 2590 5.00000 2.67081 46.6% - 11s 0 0 2.67081 0 2551 5.00000 2.67081 46.6% - 13s 0 0 2.67081 0 2610 5.00000 2.67081 46.6% - 13s 0 0 2.67081 0 2568 5.00000 2.67081 46.6% - 14s 0 2 2.80000 0 2568 5.00000 2.80000 44.0% - 17s * 21 5 13 4.0000000 3.00000 25.0% 379 18s Cutting planes: Clique: 69 Zero half: 3 Explored 27 nodes (60023 simplex iterations) in 19.40 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%