Gurobi 5.0.1 (linux64) logging started Fri Nov 16 15:11:22 2012 Optimize a model with 1560 rows, 1560 columns and 6084 nonzeros Presolve removed 4 rows and 156 columns Presolve time: 0.03s Presolved: 1556 rows, 1404 columns, 5928 nonzeros Variable types: 0 continuous, 1404 integer (1404 binary) Found heuristic solution: objective 21.0000000 Root relaxation: objective 2.000000e+00, 1394 iterations, 0.03 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 70 21.00000 2.00000 90.5% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s H 0 0 3.0000000 2.00000 33.3% - 0s 0 0 2.00000 0 70 3.00000 2.00000 33.3% - 0s 0 0 2.00000 0 70 3.00000 2.00000 33.3% - 0s 0 0 2.00000 0 70 3.00000 2.00000 33.3% - 0s 0 0 2.00000 0 107 3.00000 2.00000 33.3% - 0s 0 0 2.00000 0 108 3.00000 2.00000 33.3% - 1s 0 0 2.00000 0 108 3.00000 2.00000 33.3% - 1s 0 2 2.00000 0 108 3.00000 2.00000 33.3% - 1s Cutting planes: Gomory: 6 Zero half: 1 Explored 14 nodes (51663 simplex iterations) in 4.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+00, best bound 3.000000000000e+00, gap 0.0%