Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:26:47 2012 Optimize a model with 4514 rows, 1892 columns and 15220 nonzeros Presolve removed 1078 rows and 45 columns Presolve time: 0.10s Presolved: 3436 rows, 1847 columns, 12523 nonzeros Variable types: 0 continuous, 1847 integer (1847 binary) Found heuristic solution: objective 43.0000000 Root relaxation: objective 3.000000e+00, 3305 iterations, 0.33 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 704 43.00000 3.00000 93.0% - 1s H 0 0 32.0000000 3.00000 90.6% - 1s H 0 0 25.0000000 3.00000 88.0% - 1s 0 0 3.00000 0 705 25.00000 3.00000 88.0% - 1s H 0 0 19.0000000 3.00000 84.2% - 1s 0 0 3.00000 0 134 19.00000 3.00000 84.2% - 2s H 0 0 13.0000000 3.00000 76.9% - 2s H 0 0 4.0000000 3.00000 25.0% - 2s 0 0 3.00000 0 48 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 90 4.00000 3.00000 25.0% - 4s 0 0 3.00000 0 90 4.00000 3.00000 25.0% - 5s 0 0 3.00000 0 93 4.00000 3.00000 25.0% - 6s 0 0 3.00000 0 104 4.00000 3.00000 25.0% - 7s 0 0 3.00000 0 85 4.00000 3.00000 25.0% - 7s 0 2 3.00000 0 85 4.00000 3.00000 25.0% - 8s 4 4 3.00000 1 431 4.00000 3.00000 25.0% 734 11s 8 7 3.00000 1 106 4.00000 3.00000 25.0% 367 15s Cutting planes: Gomory: 17 Zero half: 120 Explored 9 nodes (91932 simplex iterations) in 16.77 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%