Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:14:01 2012 Optimize a model with 3666 rows, 1560 columns and 12402 nonzeros Presolve removed 819 rows and 0 columns Presolve time: 0.07s Presolved: 2847 rows, 1560 columns, 10413 nonzeros Variable types: 0 continuous, 1560 integer (1560 binary) Found heuristic solution: objective 19.0000000 Root relaxation: objective 3.000000e+00, 2601 iterations, 0.14 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 57 19.00000 3.00000 84.2% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 139 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 92 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 126 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 109 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 118 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 125 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 124 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 112 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 52 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 70 4.00000 3.00000 25.0% - 8s 0 0 3.00000 0 70 4.00000 3.00000 25.0% - 8s 0 2 3.00000 0 70 4.00000 3.00000 25.0% - 9s 4 4 3.00000 1 74 4.00000 3.00000 25.0% 528 10s 10 8 3.00000 1 62 4.00000 3.00000 25.0% 211 15s 16 12 3.00000 1 58 4.00000 3.00000 25.0% 132 20s 25 14 infeasible 16 4.00000 4.00000 0.0% 4309 25s Cutting planes: Gomory: 2 Clique: 2 Zero half: 12 Explored 26 nodes (184651 simplex iterations) in 25.07 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%