Gurobi 5.0.1 (linux64) logging started Fri Nov 16 12:11:40 2012 Optimize a model with 18530 rows, 5112 columns and 60348 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.63s Presolved: 18599 rows, 5110 columns, 64867 nonzeros Variable types: 0 continuous, 5110 integer (5110 binary) Found heuristic solution: objective 71.0000000 Root relaxation: objective 2.000000e+00, 3663 iterations, 0.16 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 142 71.00000 2.00000 97.2% - 1s H 0 0 69.0000000 2.00000 97.1% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 2.66667 0 261 5.00000 2.66667 46.7% - 8s 0 0 2.67317 0 4446 5.00000 2.67317 46.5% - 10s 0 0 2.67317 0 4406 5.00000 2.67317 46.5% - 12s 0 0 2.67317 0 4401 5.00000 2.67317 46.5% - 12s 0 0 2.67317 0 4407 5.00000 2.67317 46.5% - 13s 0 0 2.67317 0 4098 5.00000 2.67317 46.5% - 16s 0 0 2.67317 0 4127 5.00000 2.67317 46.5% - 17s 0 0 2.67317 0 4274 5.00000 2.67317 46.5% - 20s 0 0 2.67317 0 4246 5.00000 2.67317 46.5% - 22s 0 0 2.67317 0 4201 5.00000 2.67317 46.5% - 25s 0 0 2.67317 0 4199 5.00000 2.67317 46.5% - 27s 0 0 2.67317 0 4187 5.00000 2.67317 46.5% - 30s 0 0 2.67317 0 4214 5.00000 2.67317 46.5% - 33s 0 0 2.67317 0 4218 5.00000 2.67317 46.5% - 35s 0 0 2.67317 0 4188 5.00000 2.67317 46.5% - 36s 0 2 3.00000 0 4188 5.00000 3.00000 40.0% - 50s * 24 3 19 4.0000000 3.00000 25.0% 408 52s Cutting planes: Clique: 151 Zero half: 32 Explored 32 nodes (98991 simplex iterations) in 52.45 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%