Gurobi 5.0.1 (linux64) logging started Sat Nov 17 09:36:53 2012 Optimize a model with 78488 rows, 59292 columns and 293542 nonzeros Presolve removed 19 rows and 4617 columns (presolve time = 5s) ... Presolve removed 21 rows and 4619 columns Presolve time: 6.45s Presolved: 78467 rows, 54673 columns, 288279 nonzeros Variable types: 0 continuous, 54673 integer (54673 binary) Found heuristic solution: objective 243.0000000 Root relaxation: objective 2.000000e+00, 40157 iterations, 4.73 seconds Total elapsed time = 17.08s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 444 243.00000 2.00000 99.2% - 19s H 0 0 172.0000000 2.00000 98.8% - 19s H 0 0 4.0000000 2.00000 50.0% - 19s H 0 0 3.0000000 2.00000 33.3% - 19s 0 0 infeasible 0 3.00000 2.00000 33.3% - 19s Cutting planes: Gomory: 1 Clique: 2 Zero half: 61 Explored 0 nodes (128653 simplex iterations) in 19.78 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%