Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:12:14 2013 Optimize a model with 48369 rows, 47679 columns and 190509 nonzeros Presolve removed 2448 rows and 0 columns Presolve time: 0.29s Presolved: 45921 rows, 47679 columns, 185613 nonzeros Variable types: 47610 continuous, 69 integer (69 binary) Root relaxation: objective 7.607387e+04, 8977 iterations, 1.44 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 76073.8653 0 5 - 76073.8653 - - 1s H 0 0 77961.000000 76073.8653 2.42% - 2s H 0 0 76914.000000 76073.8653 1.09% - 2s 0 0 76083.3532 0 6 76914.0000 76083.3532 1.08% - 2s 0 0 76083.6160 0 6 76914.0000 76083.6160 1.08% - 2s 0 0 76083.8954 0 6 76914.0000 76083.8954 1.08% - 3s 0 0 76083.9484 0 6 76914.0000 76083.9484 1.08% - 3s 0 0 76084.1237 0 6 76914.0000 76084.1237 1.08% - 3s 0 0 76084.1685 0 6 76914.0000 76084.1685 1.08% - 3s 0 0 76084.1685 0 5 76914.0000 76084.1685 1.08% - 6s 0 0 76084.1685 0 6 76914.0000 76084.1685 1.08% - 6s 0 0 76084.5108 0 6 76914.0000 76084.5108 1.08% - 6s 0 0 76084.5108 0 6 76914.0000 76084.5108 1.08% - 6s 0 2 76091.1367 0 6 76914.0000 76091.1367 1.07% - 7s H 14 9 76599.000000 76091.1367 0.66% 123 9s * 16 4 15 76468.000000 76091.1367 0.49% 109 9s Cutting planes: Gomory: 1 Flow cover: 13 Explored 23 nodes (17499 simplex iterations) in 9.38 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.646800000000e+04, best bound 7.646800000000e+04, gap 0.0%