Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:05:15 2012 Optimize a model with 7128 rows, 2970 columns and 24138 nonzeros Presolve removed 1188 rows and 0 columns Presolve time: 0.13s Presolved: 5940 rows, 2970 columns, 21438 nonzeros Variable types: 0 continuous, 2970 integer (2970 binary) Found heuristic solution: objective 31.0000000 Root relaxation: objective 3.000000e+00, 4626 iterations, 0.45 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 104 31.00000 3.00000 90.3% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 188 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 56 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 110 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 112 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 105 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 117 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 117 4.00000 3.00000 25.0% - 9s 0 2 3.00000 0 115 4.00000 3.00000 25.0% - 10s 5 5 3.00000 1 97 4.00000 3.00000 25.0% 1332 17s 6 6 3.00000 1 143 4.00000 3.00000 25.0% 1110 21s 7 6 3.00000 1 176 4.00000 3.00000 25.0% 951 25s 9 8 3.00000 1 149 4.00000 3.00000 25.0% 740 32s 10 8 3.00000 1 227 4.00000 3.00000 25.0% 666 38s 11 9 3.00000 1 109 4.00000 3.00000 25.0% 605 41s 14 11 3.00000 12 118 4.00000 3.00000 25.0% 8789 46s Cutting planes: Gomory: 12 Zero half: 25 Explored 19 nodes (200964 simplex iterations) in 49.31 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%