Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:02:29 2012 Optimize a model with 8585 rows, 2862 columns and 28353 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.17s Presolved: 8636 rows, 2860 columns, 30838 nonzeros Variable types: 0 continuous, 2860 integer (2860 binary) Found heuristic solution: objective 53.0000000 Root relaxation: objective 2.000000e+00, 2201 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 106 53.00000 2.00000 96.2% - 0s H 0 0 49.0000000 2.00000 95.9% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 202 4.00000 2.66667 33.3% - 1s 0 0 2.67550 0 2617 4.00000 2.67550 33.1% - 1s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 129 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 130 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 135 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 135 4.00000 3.00000 25.0% - 2s 0 2 3.00000 0 135 4.00000 3.00000 25.0% - 2s Cutting planes: Gomory: 2 Zero half: 12 Explored 3 nodes (13745 simplex iterations) in 2.03 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%