Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:43:13 2012 Optimize a model with 6915 rows, 2756 columns and 23242 nonzeros Presolve removed 1146 rows and 2 columns Presolve time: 0.18s Presolved: 5821 rows, 2754 columns, 22916 nonzeros Variable types: 0 continuous, 2754 integer (2754 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 4563 iterations, 0.57 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 375 52.00000 3.00000 94.2% - 2s H 0 0 51.0000000 3.00000 94.1% - 2s H 0 0 8.0000000 3.00000 62.5% - 2s H 0 0 7.0000000 3.00000 57.1% - 2s 0 0 3.00000 0 1216 7.00000 3.00000 57.1% - 2s H 0 0 5.0000000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 3s 0 0 3.00000 0 54 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 103 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 113 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 15s 0 2 3.00000 0 98 4.00000 3.00000 25.0% - 18s 4 4 3.00000 1 574 4.00000 3.00000 25.0% 789 23s 5 5 3.00000 1 72 4.00000 3.00000 25.0% 631 27s 6 6 3.00000 1 120 4.00000 3.00000 25.0% 526 30s 8 7 3.00000 1 89 4.00000 3.00000 25.0% 395 38s 9 8 3.00000 1 89 4.00000 3.00000 25.0% 351 45s 13 12 3.00000 12 75 4.00000 3.00000 25.0% 7622 51s 16 12 3.00000 13 76 4.00000 3.00000 25.0% 6316 55s Cutting planes: Clique: 1 Zero half: 16 Explored 24 nodes (186340 simplex iterations) in 59.50 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%