Gurobi 5.0.1 (linux64) logging started Fri Nov 16 01:12:01 2012 Optimize a model with 3899 rows, 650 columns and 12223 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.07s Presolved: 3897 rows, 648 columns, 19679 nonzeros Variable types: 0 continuous, 648 integer (648 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 4.486486e+00, 3412 iterations, 0.26 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 4.48649 0 303 25.00000 4.48649 82.1% - 0s 0 0 6.00000 0 16 25.00000 6.00000 76.0% - 1s H 0 0 23.0000000 6.00000 73.9% - 1s H 0 0 17.0000000 6.00000 64.7% - 1s H 0 0 7.0000000 6.00000 14.3% - 1s 0 0 6.00000 0 18 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 14 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 39 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 35 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 18 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 30 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 16 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 28 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 36 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 24 7.00000 6.00000 14.3% - 1s 0 0 6.00000 0 24 7.00000 6.00000 14.3% - 1s 0 0 infeasible 0 7.00000 7.00000 0.0% - 1s Cutting planes: Zero half: 2 Explored 1 nodes (11063 simplex iterations) in 1.45 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.000000000000e+00, best bound 7.000000000000e+00, gap 0.0%