Gurobi 5.0.1 (linux64) logging started Fri Nov 16 02:26:45 2012 Optimize a model with 8678 rows, 1122 columns and 26992 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.10s Presolved: 8676 rows, 1120 columns, 28953 nonzeros Variable types: 0 continuous, 1120 integer (1120 binary) Found heuristic solution: objective 33.0000000 Root relaxation: objective 3.377778e+00, 7050 iterations, 0.51 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.37778 0 1023 33.00000 3.37778 89.8% - 1s 0 0 5.00000 0 109 33.00000 5.00000 84.8% - 2s H 0 0 11.0000000 5.00000 54.5% - 2s 0 0 5.33333 0 118 11.00000 5.33333 51.5% - 2s 0 0 6.00000 0 110 11.00000 6.00000 45.5% - 3s H 0 0 10.0000000 6.00000 40.0% - 3s H 0 0 8.0000000 6.00000 25.0% - 3s 0 0 6.00000 0 229 8.00000 6.00000 25.0% - 3s 0 0 6.00000 0 174 8.00000 6.00000 25.0% - 3s 0 0 6.00000 0 137 8.00000 6.00000 25.0% - 4s 0 0 6.00000 0 175 8.00000 6.00000 25.0% - 4s 0 0 6.00000 0 140 8.00000 6.00000 25.0% - 4s 0 0 6.00298 0 274 8.00000 6.00298 25.0% - 4s 0 0 6.01556 0 296 8.00000 6.01556 24.8% - 4s 0 0 6.03606 0 269 8.00000 6.03606 24.5% - 4s 0 0 6.05370 0 279 8.00000 6.05370 24.3% - 4s 0 0 6.06338 0 275 8.00000 6.06338 24.2% - 4s 0 0 6.06494 0 278 8.00000 6.06494 24.2% - 4s 0 0 6.07732 0 296 8.00000 6.07732 24.0% - 4s 0 0 6.08014 0 294 8.00000 6.08014 24.0% - 4s 0 0 6.08075 0 296 8.00000 6.08075 24.0% - 5s 0 0 6.08075 0 281 8.00000 6.08075 24.0% - 5s 0 2 6.08077 0 281 8.00000 6.08077 24.0% - 5s 1118 28 7.00000 3 114 8.00000 7.00000 12.5% 49.3 10s 1522 26 7.00000 33 71 8.00000 7.00000 12.5% 64.7 15s Cutting planes: Gomory: 2 Zero half: 3 Explored 3079 nodes (232968 simplex iterations) in 19.39 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%