Gurobi 5.0.1 (linux64) logging started Fri Nov 16 09:08:12 2012 Optimize a model with 13324 rows, 4290 columns and 43938 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.39s Presolved: 13387 rows, 4288 columns, 47753 nonzeros Variable types: 0 continuous, 4288 integer (4288 binary) Found heuristic solution: objective 65.0000000 Root relaxation: objective 2.000000e+00, 3233 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 0 130 65.00000 2.00000 96.9% - 0s H 0 0 64.0000000 2.00000 96.9% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s 0 0 2.66667 0 178 5.00000 2.66667 46.7% - 3s 0 0 2.67021 0 3737 5.00000 2.67021 46.6% - 3s 0 0 2.67021 0 3739 5.00000 2.67021 46.6% - 5s 0 0 2.67021 0 3207 5.00000 2.67021 46.6% - 7s 0 0 2.67021 0 3068 5.00000 2.67021 46.6% - 9s 0 0 2.67021 0 3216 5.00000 2.67021 46.6% - 10s 0 0 2.67021 0 3177 5.00000 2.67021 46.6% - 12s 0 0 2.67021 0 3199 5.00000 2.67021 46.6% - 14s 0 0 2.67021 0 3120 5.00000 2.67021 46.6% - 16s 0 0 2.67021 0 3198 5.00000 2.67021 46.6% - 17s 0 0 2.67021 0 3200 5.00000 2.67021 46.6% - 19s 0 0 2.67021 0 3200 5.00000 2.67021 46.6% - 20s 0 2 2.80000 0 3200 5.00000 2.80000 44.0% - 28s 7 3 4.00000 2 90 5.00000 3.00000 40.0% 1705 31s * 22 4 15 4.0000000 3.00000 25.0% 656 31s Cutting planes: Clique: 82 Zero half: 5 Explored 27 nodes (77446 simplex iterations) in 32.41 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%