Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:48:05 2013 Optimize a model with 41664 rows, 41024 columns and 163904 nonzeros Presolve removed 1616 rows and 0 columns Presolve time: 0.24s Presolved: 40048 rows, 41024 columns, 160672 nonzeros Variable types: 40960 continuous, 64 integer (64 binary) Root relaxation: objective 6.831407e+04, 8001 iterations, 1.19 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 68314.0691 0 6 - 68314.0691 - - 1s H 0 0 68961.000000 68314.0691 0.94% - 1s H 0 0 68924.000000 68314.0691 0.88% - 1s H 0 0 68474.000000 68314.0691 0.23% - 1s 0 0 68314.2399 0 8 68474.0000 68314.2399 0.23% - 1s 0 0 68314.2399 0 8 68474.0000 68314.2399 0.23% - 2s 0 0 68358.8766 0 4 68474.0000 68358.8766 0.17% - 2s H 0 0 68465.000000 68358.8766 0.16% - 3s 0 0 68358.8766 0 4 68465.0000 68358.8766 0.16% - 3s 0 0 68359.0572 0 5 68465.0000 68359.0572 0.15% - 4s 0 0 68359.0572 0 5 68465.0000 68359.0572 0.15% - 4s 0 2 68359.7453 0 5 68465.0000 68359.7453 0.15% - 4s * 5 3 5 68387.000000 68385.2497 0.00% 19.4 4s Cutting planes: Gomory: 1 Flow cover: 3 Explored 6 nodes (10132 simplex iterations) in 4.50 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.838700000000e+04, best bound 6.838524973656e+04, gap 0.0026%