Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:50:54 2012 Optimize a model with 8007 rows, 3192 columns and 26934 nonzeros Presolve removed 1347 rows and 58 columns Presolve time: 0.25s Presolved: 6660 rows, 3134 columns, 23504 nonzeros Variable types: 0 continuous, 3134 integer (3134 binary) Found heuristic solution: objective 56.0000000 Root relaxation: objective 3.000000e+00, 5665 iterations, 0.85 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 87 56.00000 3.00000 94.6% - 5s H 0 0 20.0000000 3.00000 85.0% - 5s H 0 0 5.0000000 3.00000 40.0% - 5s H 0 0 4.0000000 3.00000 25.0% - 5s 0 0 3.00000 0 122 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 128 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 139 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 143 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 14s 0 2 3.00000 0 120 4.00000 3.00000 25.0% - 18s 2 3 3.00000 1 120 4.00000 3.00000 25.0% 2494 20s 4 4 3.00000 1 72 4.00000 3.00000 25.0% 1247 25s 6 6 3.00000 1 125 4.00000 3.00000 25.0% 832 30s 8 7 3.00000 1 113 4.00000 3.00000 25.0% 624 36s 9 8 3.00000 1 118 4.00000 3.00000 25.0% 554 42s 10 8 3.00000 1 120 4.00000 3.00000 25.0% 499 51s 13 12 3.00000 14 82 4.00000 3.00000 25.0% 10290 57s 14 13 3.00000 14 84 4.00000 3.00000 25.0% 9713 60s Cutting planes: Zero half: 11 Explored 19 nodes (210552 simplex iterations) in 62.19 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%