Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:14:34 2012 Optimize a model with 3704 rows, 1560 columns and 12478 nonzeros Presolve removed 821 rows and 2 columns Presolve time: 0.10s Presolved: 2883 rows, 1558 columns, 10341 nonzeros Variable types: 0 continuous, 1558 integer (1558 binary) Found heuristic solution: objective 39.0000000 Root relaxation: objective 3.000000e+00, 2544 iterations, 0.22 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 538 39.00000 3.00000 92.3% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 85 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 96 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 88 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 82 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 73 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 86 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 64 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 48 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 80 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 79 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 81 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 81 4.00000 3.00000 25.0% - 8s 0 2 3.00000 0 72 4.00000 3.00000 25.0% - 9s 4 4 3.00000 1 112 4.00000 3.00000 25.0% 702 10s 9 8 3.00000 1 119 4.00000 3.00000 25.0% 312 15s Cutting planes: Gomory: 24 Clique: 1 Zero half: 92 Explored 9 nodes (103902 simplex iterations) in 16.11 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%