Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:36:30 2013 Optimize a model with 37881 rows, 37271 columns and 148901 nonzeros Presolve removed 1659 rows and 0 columns Presolve time: 0.21s Presolved: 36222 rows, 37271 columns, 145583 nonzeros Variable types: 37210 continuous, 61 integer (61 binary) Root relaxation: objective 7.365724e+04, 8782 iterations, 1.31 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 73657.2431 0 3 - 73657.2431 - - 1s H 0 0 74419.000000 73657.2431 1.02% - 1s 0 0 73658.2455 0 4 74419.0000 73658.2455 1.02% - 2s 0 0 73658.4551 0 4 74419.0000 73658.4551 1.02% - 2s H 0 0 73868.000000 73658.4551 0.28% - 2s 0 0 73658.9435 0 2 73868.0000 73658.9435 0.28% - 4s 0 0 73661.3231 0 4 73868.0000 73661.3231 0.28% - 4s 0 2 73662.4359 0 4 73868.0000 73662.4359 0.28% - 5s * 4 4 4 73797.000000 73746.9524 0.07% 59.2 5s Cutting planes: Gomory: 2 Flow cover: 3 Explored 8 nodes (12714 simplex iterations) in 5.36 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.379700000000e+04, best bound 7.379700000000e+04, gap 0.0%