Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:31:16 2012 Optimize a model with 6864 rows, 2756 columns and 23140 nonzeros Presolve removed 1144 rows and 0 columns Presolve time: 0.15s Presolved: 5720 rows, 2756 columns, 20332 nonzeros Variable types: 0 continuous, 2756 integer (2756 binary) Found heuristic solution: objective 31.0000000 Root relaxation: objective 3.000000e+00, 4823 iterations, 0.51 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 60 31.00000 3.00000 90.3% - 1s H 0 0 5.0000000 3.00000 40.0% - 1s 0 0 3.00000 0 115 5.00000 3.00000 40.0% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 112 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 87 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 110 4.00000 3.00000 25.0% - 9s 0 0 3.00000 0 100 4.00000 3.00000 25.0% - 12s 0 0 3.00000 0 99 4.00000 3.00000 25.0% - 14s 0 0 3.00000 0 108 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 108 4.00000 3.00000 25.0% - 16s 0 2 3.00000 0 108 4.00000 3.00000 25.0% - 19s 4 4 3.00000 1 104 4.00000 3.00000 25.0% 2207 21s 7 6 3.00000 1 112 4.00000 3.00000 25.0% 1261 25s 10 8 3.00000 1 111 4.00000 3.00000 25.0% 883 32s 11 9 3.00000 1 134 4.00000 3.00000 25.0% 803 37s 14 11 infeasible 13 4.00000 3.00000 25.0% 7828 41s 17 13 3.00000 14 90 4.00000 3.00000 25.0% 6538 46s 24 14 3.00000 17 74 4.00000 3.00000 25.0% 4770 50s 50 1 infeasible 17 4.00000 3.00000 25.0% 2639 55s Cutting planes: Gomory: 6 Clique: 2 Zero half: 11 Explored 52 nodes (246213 simplex iterations) in 55.32 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%