Gurobi 5.0.1 (linux64) logging started Fri Nov 16 10:04:10 2012 Optimize a model with 15208 rows, 4556 columns and 49846 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.47s Presolved: 15206 rows, 4554 columns, 49392 nonzeros Variable types: 0 continuous, 4554 integer (4554 binary) Found heuristic solution: objective 67.0000000 Root relaxation: objective 2.000000e+00, 3234 iterations, 0.12 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 134 67.00000 2.00000 97.0% - 0s H 0 0 56.0000000 2.00000 96.4% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 196 4.00000 2.66667 33.3% - 5s 0 0 2.67010 0 4157 4.00000 2.67010 33.2% - 5s 0 0 2.67010 0 4162 4.00000 2.67010 33.2% - 8s 0 0 2.67010 0 4013 4.00000 2.67010 33.2% - 9s 0 0 2.67010 0 4031 4.00000 2.67010 33.2% - 11s 0 0 2.67010 0 3963 4.00000 2.67010 33.2% - 12s 0 0 2.67010 0 4044 4.00000 2.67010 33.2% - 13s 0 0 2.67010 0 4014 4.00000 2.67010 33.2% - 15s 0 0 2.67010 0 3990 4.00000 2.67010 33.2% - 16s 0 0 2.67010 0 4020 4.00000 2.67010 33.2% - 17s 0 0 2.67010 0 4030 4.00000 2.67010 33.2% - 19s 0 0 2.67010 0 4030 4.00000 2.67010 33.2% - 20s 0 2 2.80000 0 4030 4.00000 2.80000 30.0% - 35s Cutting planes: Clique: 96 Zero half: 6 Explored 9 nodes (63546 simplex iterations) in 37.18 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%