Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:22:42 2012 Optimize a model with 6528 rows, 2652 columns and 22032 nonzeros Presolve removed 1786 rows and 51 columns Presolve time: 0.14s Presolved: 4742 rows, 2601 columns, 17901 nonzeros Variable types: 0 continuous, 2601 integer (2601 binary) Found heuristic solution: objective 32.0000000 Root relaxation: objective 3.000000e+00, 5048 iterations, 0.52 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 58 32.00000 3.00000 90.6% - 1s H 0 0 5.0000000 3.00000 40.0% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 290 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 99 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 100 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 96 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 97 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 101 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 64 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 97 4.00000 3.00000 25.0% - 13s 0 0 3.00000 0 97 4.00000 3.00000 25.0% - 14s 0 2 3.00000 0 97 4.00000 3.00000 25.0% - 15s 6 6 3.00000 1 58 4.00000 3.00000 25.0% 396 22s 8 7 3.00000 1 112 4.00000 3.00000 25.0% 297 26s 10 8 3.00000 1 58 4.00000 3.00000 25.0% 238 31s 11 9 3.00000 1 94 4.00000 3.00000 25.0% 216 35s Cutting planes: Gomory: 6 Zero half: 2 Explored 18 nodes (184294 simplex iterations) in 39.02 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%