Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:52:43 2012 Optimize a model with 8791 rows, 3192 columns and 29286 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.20s Presolved: 8789 rows, 3190 columns, 28972 nonzeros Variable types: 0 continuous, 3190 integer (3190 binary) Found heuristic solution: objective 56.0000000 Root relaxation: objective 2.000000e+00, 2460 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 112 56.00000 2.00000 96.4% - 0s H 0 0 53.0000000 2.00000 96.2% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 2150 5.00000 2.66667 46.7% - 1s 0 0 2.66667 0 1840 5.00000 2.66667 46.7% - 2s H 0 0 4.0000000 2.66667 33.3% - 3s 0 0 2.66667 0 2532 4.00000 2.66667 33.3% - 4s 0 0 2.66667 0 123 4.00000 2.66667 33.3% - 10s 0 0 2.67081 0 2312 4.00000 2.67081 33.2% - 14s 0 0 2.67114 0 2304 4.00000 2.67114 33.2% - 19s 0 0 3.00000 0 128 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 127 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 117 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 110 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 115 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 137 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 84 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 118 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 136 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 136 4.00000 3.00000 25.0% - 20s 0 2 3.00000 0 136 4.00000 3.00000 25.0% - 20s Cutting planes: Gomory: 16 Clique: 2 Zero half: 114 Explored 7 nodes (73417 simplex iterations) in 20.63 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%