Gurobi 5.0.1 (linux64) logging started Mon Nov 19 06:44:36 2012 Optimize a model with 1587 rows, 80 columns and 3174 nonzeros Presolve removed 1114 rows and 0 columns Presolve time: 0.04s Presolved: 473 rows, 80 columns, 3011 nonzeros Variable types: 0 continuous, 80 integer (80 binary) Found heuristic solution: objective 6.0000000 Root relaxation: objective 1.196747e+01, 293 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 11.96747 0 74 6.00000 11.96747 99.5% - 0s H 0 0 7.0000000 11.96747 71.0% - 0s 0 0 11.76743 0 76 7.00000 11.76743 68.1% - 0s 0 0 11.72202 0 79 7.00000 11.72202 67.5% - 0s 0 0 11.66308 0 78 7.00000 11.66308 66.6% - 0s H 0 0 8.0000000 11.66308 45.8% - 0s 0 0 11.63787 0 77 8.00000 11.63787 45.5% - 0s 0 0 11.63559 0 77 8.00000 11.63559 45.4% - 0s 0 0 11.63287 0 78 8.00000 11.63287 45.4% - 0s 0 0 11.62459 0 78 8.00000 11.62459 45.3% - 0s 0 0 11.62028 0 78 8.00000 11.62028 45.3% - 0s 0 0 11.61939 0 78 8.00000 11.61939 45.2% - 0s 0 0 11.61934 0 78 8.00000 11.61934 45.2% - 0s 0 2 11.61881 0 78 8.00000 11.61881 45.2% - 0s Cutting planes: Clique: 35 Zero half: 4 Explored 90 nodes (4786 simplex iterations) in 0.65 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%