Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:51:42 2013 Optimize a model with 42965 rows, 42315 columns and 169065 nonzeros Presolve removed 2420 rows and 0 columns Presolve time: 0.26s Presolved: 40545 rows, 42315 columns, 164225 nonzeros Variable types: 42250 continuous, 65 integer (65 binary) Root relaxation: objective 7.313650e+04, 7402 iterations, 1.15 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 73136.5021 0 4 - 73136.5021 - - 1s H 0 0 74622.000000 73136.5021 1.99% - 1s 0 0 73138.2355 0 6 74622.0000 73138.2355 1.99% - 1s 0 0 73138.2355 0 6 74622.0000 73138.2355 1.99% - 2s 0 0 73138.2673 0 6 74622.0000 73138.2673 1.99% - 2s H 0 0 73981.751394 73138.2673 1.14% - 3s H 0 0 73692.000000 73138.2673 0.75% - 3s 0 2 73141.4724 0 6 73692.0000 73141.4724 0.75% - 4s * 12 6 12 73352.000000 73254.2884 0.13% 68.4 4s 14 4 73350.3996 2 2 73352.0000 73280.6035 0.10% 81.4 5s Cutting planes: Gomory: 2 Flow cover: 4 Explored 19 nodes (8849 simplex iterations) in 5.15 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.335200000000e+04, best bound 7.335200000000e+04, gap 0.0%