Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:29:18 2012 Optimize a model with 8931 rows, 3422 columns and 29926 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.20s Presolved: 8987 rows, 3420 columns, 32982 nonzeros Variable types: 0 continuous, 3420 integer (3420 binary) Found heuristic solution: objective 58.0000000 Root relaxation: objective 2.000000e+00, 2578 iterations, 0.08 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 114 58.00000 2.00000 96.6% - 0s H 0 0 52.0000000 2.00000 96.2% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 2694 4.00000 2.66667 33.3% - 1s 0 0 2.67066 0 2780 4.00000 2.67066 33.2% - 2s 0 0 2.67066 0 2780 4.00000 2.67066 33.2% - 3s 0 0 2.67066 0 2469 4.00000 2.67066 33.2% - 5s 0 0 2.67066 0 2469 4.00000 2.67066 33.2% - 6s 0 0 2.67066 0 2486 4.00000 2.67066 33.2% - 7s 0 0 2.67066 0 2477 4.00000 2.67066 33.2% - 9s 0 0 2.67066 0 2472 4.00000 2.67066 33.2% - 10s 0 0 2.67066 0 2470 4.00000 2.67066 33.2% - 12s 0 0 2.67066 0 2470 4.00000 2.67066 33.2% - 13s 0 2 2.80000 0 2470 4.00000 2.80000 30.0% - 16s Cutting planes: Clique: 66 Zero half: 3 Explored 7 nodes (51887 simplex iterations) in 17.63 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%