Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:35:37 2012 Optimize a model with 6499 rows, 2756 columns and 21994 nonzeros Presolve removed 1198 rows and 2 columns Presolve time: 0.17s Presolved: 5301 rows, 2754 columns, 18982 nonzeros Variable types: 0 continuous, 2754 integer (2754 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 4711 iterations, 0.60 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 845 52.00000 3.00000 94.2% - 2s H 0 0 14.0000000 3.00000 78.6% - 2s 0 0 3.00000 0 78 14.00000 3.00000 78.6% - 2s H 0 0 5.0000000 3.00000 40.0% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 97 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 95 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 70 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 64 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 66 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 64 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 72 4.00000 3.00000 25.0% - 13s 0 0 3.00000 0 97 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 97 4.00000 3.00000 25.0% - 15s 0 2 3.00000 0 97 4.00000 3.00000 25.0% - 18s 4 4 3.00000 1 455 4.00000 3.00000 25.0% 814 23s 5 5 3.00000 1 111 4.00000 3.00000 25.0% 651 26s 7 6 3.00000 1 60 4.00000 3.00000 25.0% 465 31s 9 8 3.00000 1 76 4.00000 3.00000 25.0% 362 38s 12 12 3.00000 14 93 4.00000 3.00000 25.0% 6987 43s 13 12 3.00000 14 98 4.00000 3.00000 25.0% 6541 46s Cutting planes: Gomory: 5 Zero half: 6 Explored 18 nodes (183146 simplex iterations) in 46.96 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%