Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:02:48 2012 Optimize a model with 6624 rows, 2862 columns and 22470 nonzeros Presolve removed 1433 rows and 2 columns Presolve time: 0.17s Presolved: 5244 rows, 2860 columns, 21850 nonzeros Variable types: 0 continuous, 2860 integer (2860 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 3.000000e+00, 4889 iterations, 0.64 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 60 52.00000 3.00000 94.2% - 3s H 0 0 34.0000000 3.00000 91.2% - 3s H 0 0 5.0000000 3.00000 40.0% - 3s 0 0 3.00000 0 125 5.00000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 4s 0 0 3.00000 0 88 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 143 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 70 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 102 4.00000 3.00000 25.0% - 16s 0 0 3.00000 0 103 4.00000 3.00000 25.0% - 18s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 20s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 21s 0 2 3.00000 0 106 4.00000 3.00000 25.0% - 24s 2 3 3.00000 1 106 4.00000 3.00000 25.0% 2476 26s 5 5 3.00000 1 106 4.00000 3.00000 25.0% 991 32s 6 6 3.00000 1 113 4.00000 3.00000 25.0% 826 35s Cutting planes: Gomory: 19 Zero half: 56 Explored 8 nodes (172119 simplex iterations) in 38.96 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%