Gurobi 5.0.1 (linux64) logging started Fri Nov 16 01:44:20 2012 Optimize a model with 6292 rows, 870 columns and 19602 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.08s Presolved: 6319 rows, 868 columns, 25889 nonzeros Variable types: 0 continuous, 868 integer (868 binary) Found heuristic solution: objective 29.0000000 Root relaxation: objective 3.753247e+00, 6880 iterations, 0.43 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.75325 0 625 29.00000 3.75325 87.1% - 1s H 0 0 28.0000000 3.75325 86.6% - 1s 0 0 7.00000 0 118 28.00000 7.00000 75.0% - 1s H 0 0 24.0000000 7.00000 70.8% - 1s H 0 0 8.0000000 7.00000 12.5% - 1s 0 0 7.00000 0 43 8.00000 7.00000 12.5% - 1s 0 0 7.00000 0 16 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 70 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 32 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 14 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 43 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 36 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 16 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 27 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 30 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 18 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 17 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 14 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 16 8.00000 7.00000 12.5% - 2s 0 0 7.00000 0 12 8.00000 7.00000 12.5% - 2s 0 2 7.00000 0 12 8.00000 7.00000 12.5% - 2s Cutting planes: Clique: 1 Zero half: 2 Explored 9 nodes (19339 simplex iterations) in 2.59 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.000000000000e+00, best bound 8.000000000000e+00, gap 0.0%