Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:08:22 2012 Optimize a model with 1740 rows, 930 columns and 6030 nonzeros Presolve removed 510 rows and 0 columns Presolve time: 0.03s Presolved: 1230 rows, 930 columns, 4890 nonzeros Variable types: 0 continuous, 930 integer (930 binary) Found heuristic solution: objective 20.0000000 Root relaxation: objective 3.000000e+00, 1373 iterations, 0.04 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 28 20.00000 3.00000 85.0% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 74 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 53 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 48 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 69 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 63 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 75 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 88 4.00000 3.00000 25.0% - 0s 0 0 3.00000 0 78 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 55 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 76 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 76 4.00000 3.00000 25.0% - 1s 0 2 3.00000 0 63 4.00000 3.00000 25.0% - 1s Cutting planes: Gomory: 7 Zero half: 6 Explored 14 nodes (40507 simplex iterations) in 3.10 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%