Gurobi 5.0.1 (linux64) logging started Sat Nov 17 10:34:36 2012 Optimize a model with 74045 rows, 60762 columns and 281668 nonzeros Presolve removed 23 rows and 5658 columns (presolve time = 5s) ... Presolve removed 25 rows and 5660 columns Presolve time: 5.90s Presolved: 74020 rows, 55102 columns, 275408 nonzeros Variable types: 0 continuous, 55102 integer (55102 binary) Found heuristic solution: objective 246.0000000 Root relaxation: objective 2.000000e+00, 39266 iterations, 3.85 seconds Total elapsed time = 15.27s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 434 246.00000 2.00000 99.2% - 17s H 0 0 240.0000000 2.00000 99.2% - 17s H 0 0 4.0000000 2.00000 50.0% - 17s 0 0 2.66667 0 17995 4.00000 2.66667 33.3% - 48s 0 0 2.66667 0 18787 4.00000 2.66667 33.3% - 129s H 0 0 3.0000000 2.66667 11.1% - 135s Cutting planes: Clique: 2 Zero half: 6 Explored 0 nodes (171064 simplex iterations) in 135.90 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%