Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:16:58 2012 Optimize a model with 7289 rows, 2970 columns and 24568 nonzeros Presolve removed 1676 rows and 2 columns Presolve time: 0.19s Presolved: 5667 rows, 2968 columns, 23334 nonzeros Variable types: 0 continuous, 2968 integer (2968 binary) Found heuristic solution: objective 54.0000000 Root relaxation: objective 3.000000e+00, 4247 iterations, 0.53 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 98 54.00000 3.00000 94.4% - 3s H 0 0 52.0000000 3.00000 94.2% - 3s H 0 0 13.0000000 3.00000 76.9% - 3s H 0 0 5.0000000 3.00000 40.0% - 3s 0 0 3.00000 0 123 5.00000 3.00000 40.0% - 3s H 0 0 4.0000000 3.00000 25.0% - 4s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 118 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 80 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 173 4.00000 3.00000 25.0% - 17s 0 0 3.00000 0 110 4.00000 3.00000 25.0% - 19s 0 0 3.00000 0 175 4.00000 3.00000 25.0% - 21s 0 0 3.00000 0 106 4.00000 3.00000 25.0% - 23s 0 2 3.00000 0 106 4.00000 3.00000 25.0% - 25s 4 4 3.00000 1 115 4.00000 3.00000 25.0% 982 30s 6 6 3.00000 1 99 4.00000 3.00000 25.0% 655 36s 8 7 3.00000 1 131 4.00000 3.00000 25.0% 491 42s 9 8 3.00000 1 191 4.00000 3.00000 25.0% 437 46s 11 9 3.00000 1 100 4.00000 3.00000 25.0% 357 53s 14 13 3.00000 12 117 4.00000 3.00000 25.0% 7852 58s 16 14 3.00000 13 102 4.00000 3.00000 25.0% 6941 61s 21 12 3.00000 15 99 4.00000 3.00000 25.0% 5451 65s Cutting planes: Gomory: 3 Zero half: 10 Explored 28 nodes (233085 simplex iterations) in 67.23 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%