Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:48:08 2012 Optimize a model with 6784 rows, 2862 columns and 23002 nonzeros Presolve removed 1484 rows and 0 columns Presolve time: 0.14s Presolved: 5300 rows, 2862 columns, 19663 nonzeros Variable types: 0 continuous, 2862 integer (2862 binary) Found heuristic solution: objective 31.0000000 Root relaxation: objective 3.000000e+00, 5803 iterations, 0.65 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 126 31.00000 3.00000 90.3% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 177 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 112 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 165 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 148 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 157 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 160 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 149 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 168 4.00000 3.00000 25.0% - 17s 0 0 3.00000 0 168 4.00000 3.00000 25.0% - 18s 0 2 3.00000 0 148 4.00000 3.00000 25.0% - 20s 5 5 3.00000 1 164 4.00000 3.00000 25.0% 2255 26s 6 6 3.00000 1 161 4.00000 3.00000 25.0% 1879 30s 8 7 3.00000 1 155 4.00000 3.00000 25.0% 1410 36s 9 8 3.00000 1 64 4.00000 3.00000 25.0% 1253 40s 12 10 3.00000 1 93 4.00000 3.00000 25.0% 940 45s 13 10 3.00000 1 99 4.00000 3.00000 25.0% 867 50s 18 14 3.00000 12 113 4.00000 3.00000 25.0% 8710 55s Cutting planes: Gomory: 4 Zero half: 2 Explored 24 nodes (271225 simplex iterations) in 57.66 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%