Gurobi 5.0.1 (linux64) logging started Fri Nov 16 02:07:30 2012 Optimize a model with 7594 rows, 992 columns and 23620 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.09s Presolved: 7623 rows, 990 columns, 28044 nonzeros Variable types: 0 continuous, 990 integer (990 binary) Found heuristic solution: objective 31.0000000 Root relaxation: objective 3.450000e+00, 5557 iterations, 0.37 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.45000 0 889 31.00000 3.45000 88.9% - 0s 0 0 6.00000 0 139 31.00000 6.00000 80.6% - 2s H 0 0 21.0000000 6.00000 71.4% - 2s H 0 0 9.0000000 6.00000 33.3% - 2s 0 0 6.00000 0 118 9.00000 6.00000 33.3% - 3s 0 0 6.00000 0 126 9.00000 6.00000 33.3% - 3s 0 0 6.00000 0 170 9.00000 6.00000 33.3% - 3s 0 0 6.04236 0 187 9.00000 6.04236 32.9% - 4s 0 0 6.13500 0 255 9.00000 6.13500 31.8% - 4s 0 0 6.17949 0 318 9.00000 6.17949 31.3% - 4s 0 0 6.33333 0 158 9.00000 6.33333 29.6% - 4s 0 0 6.34595 0 339 9.00000 6.34595 29.5% - 5s 0 0 6.35302 0 334 9.00000 6.35302 29.4% - 5s 0 0 6.35915 0 275 9.00000 6.35915 29.3% - 5s H 0 0 8.0000000 6.35915 20.5% - 5s 0 0 6.37753 0 326 8.00000 6.37753 20.3% - 5s 0 0 6.38694 0 338 8.00000 6.38694 20.2% - 5s 0 0 6.38694 0 335 8.00000 6.38694 20.2% - 5s 0 0 6.38694 0 331 8.00000 6.38694 20.2% - 5s 0 0 6.38694 0 344 8.00000 6.38694 20.2% - 5s 0 0 6.38694 0 305 8.00000 6.38694 20.2% - 5s 0 0 6.38694 0 284 8.00000 6.38694 20.2% - 6s 0 0 6.38694 0 316 8.00000 6.38694 20.2% - 6s 0 0 6.38694 0 327 8.00000 6.38694 20.2% - 7s 0 0 7.00000 0 97 8.00000 7.00000 12.5% - 7s 0 0 7.00000 0 95 8.00000 7.00000 12.5% - 7s 0 2 7.00000 0 91 8.00000 7.00000 12.5% - 7s 22 18 7.00000 21 88 8.00000 7.00000 12.5% 399 10s Cutting planes: Clique: 78 Zero half: 17 Explored 248 nodes (68807 simplex iterations) in 11.06 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%