Gurobi 5.0.1 (linux64) logging started Mon Feb 4 16:12:49 2013 Optimize a model with 781 rows, 10236 columns and 462936 nonzeros Presolve removed 54 rows and 353 columns Presolve time: 4.08s Presolved: 727 rows, 9883 columns, 445935 nonzeros Variable types: 0 continuous, 9883 integer (9883 binary) Found heuristic solution: objective 6744.0000000 Found heuristic solution: objective 5917.0000000 Root relaxation: objective 3.971292e+03, 2273 iterations, 0.48 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3971.29167 0 57 5917.00000 3971.29167 32.9% - 4s H 0 0 4474.0000000 3971.29167 11.2% - 4s * 0 0 0 3979.0000000 3979.00000 0.0% - 6s Cutting planes: Clique: 1 Zero half: 1 Explored 0 nodes (2368 simplex iterations) in 6.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.979000000000e+03, best bound 3.979000000000e+03, gap 0.0%