Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:38:56 2012 Optimize a model with 7747 rows, 2756 columns and 25738 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.15s Presolved: 7745 rows, 2754 columns, 25440 nonzeros Variable types: 0 continuous, 2754 integer (2754 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 2.000000e+00, 2226 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 0 104 50.00000 2.00000 96.0% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 570 5.00000 2.66667 46.7% - 0s 0 0 2.67114 0 2246 5.00000 2.67114 46.6% - 1s H 0 0 4.0000000 2.67114 33.2% - 1s 0 0 2.67114 0 2245 4.00000 2.67114 33.2% - 2s 0 0 2.67114 0 2244 4.00000 2.67114 33.2% - 3s 0 0 2.67114 0 2240 4.00000 2.67114 33.2% - 3s 0 0 2.67114 0 2234 4.00000 2.67114 33.2% - 4s 0 0 2.67114 0 2240 4.00000 2.67114 33.2% - 4s 0 0 2.67114 0 1807 4.00000 2.67114 33.2% - 8s 0 0 2.67114 0 1882 4.00000 2.67114 33.2% - 10s 0 0 3.00000 0 91 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 117 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 107 4.00000 3.00000 25.0% - 12s 0 0 infeasible 0 4.00000 3.00001 25.0% - 12s Cutting planes: Clique: 1 Zero half: 41 Explored 0 nodes (37334 simplex iterations) in 12.99 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%