Gurobi 5.0.1 (linux64) logging started Fri Nov 16 06:28:05 2012 Optimize a model with 9221 rows, 3422 columns and 30796 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.21s Presolved: 9277 rows, 3420 columns, 33842 nonzeros Variable types: 0 continuous, 3420 integer (3420 binary) Found heuristic solution: objective 55.0000000 Root relaxation: objective 2.000000e+00, 2570 iterations, 0.09 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 116 55.00000 2.00000 96.4% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 446 5.00000 2.66667 46.7% - 1s H 0 0 4.0000000 2.66667 33.3% - 1s 0 0 2.66667 0 1607 4.00000 2.66667 33.3% - 1s 0 0 2.66667 0 142 4.00000 2.66667 33.3% - 3s 0 0 2.67066 0 2590 4.00000 2.67066 33.2% - 6s 0 0 2.67066 0 2595 4.00000 2.67066 33.2% - 7s 0 0 2.67066 0 2432 4.00000 2.67066 33.2% - 9s 0 0 2.67066 0 2510 4.00000 2.67066 33.2% - 11s 0 0 2.67066 0 2686 4.00000 2.67066 33.2% - 13s 0 0 2.67066 0 2646 4.00000 2.67066 33.2% - 15s 0 0 2.67066 0 2608 4.00000 2.67066 33.2% - 17s 0 0 2.67066 0 2666 4.00000 2.67066 33.2% - 19s 0 0 2.67066 0 2655 4.00000 2.67066 33.2% - 21s 0 0 2.67066 0 2603 4.00000 2.67066 33.2% - 23s 0 0 2.67066 0 2666 4.00000 2.67066 33.2% - 25s 0 0 2.67066 0 2666 4.00000 2.67066 33.2% - 25s 0 2 2.80000 0 2666 4.00000 2.80000 30.0% - 30s Cutting planes: Clique: 51 Zero half: 8 Explored 11 nodes (107556 simplex iterations) in 32.09 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%