Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:04:14 2012 Optimize a model with 6095 rows, 2352 columns and 20398 nonzeros Presolve removed 1538 rows and 2 columns Presolve time: 0.15s Presolved: 4605 rows, 2350 columns, 19008 nonzeros Variable types: 0 continuous, 2350 integer (2350 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 3.000000e+00, 4344 iterations, 0.59 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 503 48.00000 3.00000 93.8% - 1s H 0 0 14.0000000 3.00000 78.6% - 1s H 0 0 11.0000000 3.00000 72.7% - 1s 0 0 3.00000 0 89 11.00000 3.00000 72.7% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 123 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 113 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 122 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 116 4.00000 3.00000 25.0% - 10s 0 0 3.00000 0 100 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 162 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 109 4.00000 3.00000 25.0% - 15s 0 2 3.00000 0 109 4.00000 3.00000 25.0% - 17s 4 4 3.00000 1 807 4.00000 3.00000 25.0% 524 22s 6 6 3.00000 1 64 4.00000 3.00000 25.0% 350 27s 8 7 3.00000 1 95 4.00000 3.00000 25.0% 262 30s Cutting planes: Gomory: 7 Zero half: 37 Explored 9 nodes (140940 simplex iterations) in 31.89 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%