Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:07:43 2012 Optimize a model with 6125 rows, 2450 columns and 20629 nonzeros Presolve removed 1813 rows and 0 columns Presolve time: 0.13s Presolved: 4312 rows, 2450 columns, 16415 nonzeros Variable types: 0 continuous, 2450 integer (2450 binary) Found heuristic solution: objective 31.0000000 Root relaxation: objective 3.000000e+00, 3461 iterations, 0.35 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 110 31.00000 3.00000 90.3% - 1s H 0 0 7.0000000 3.00000 57.1% - 1s H 0 0 5.0000000 3.00000 40.0% - 1s 0 0 3.00000 0 353 5.00000 3.00000 40.0% - 1s 0 0 3.00000 0 95 5.00000 3.00000 40.0% - 3s 0 0 3.00000 0 140 5.00000 3.00000 40.0% - 5s H 0 0 4.0000000 3.00000 25.0% - 5s 0 0 3.00000 0 139 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 157 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 144 4.00000 3.00000 25.0% - 11s 0 0 3.00000 0 151 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 151 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 151 4.00000 3.00000 25.0% - 15s 0 2 3.00000 0 135 4.00000 3.00000 25.0% - 18s 5 5 3.00000 1 104 4.00000 3.00000 25.0% 1647 21s 7 6 3.00000 1 127 4.00000 3.00000 25.0% 1177 26s 9 8 3.00000 1 157 4.00000 3.00000 25.0% 915 32s 11 9 3.00000 1 146 4.00000 3.00000 25.0% 749 35s 13 10 3.00000 15 202 4.00000 3.00000 25.0% 6310 41s Cutting planes: Gomory: 5 Zero half: 26 Explored 18 nodes (175930 simplex iterations) in 44.46 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%