Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:45:54 2013 Optimize a model with 55574 rows, 54834 columns and 219114 nonzeros Presolve removed 3114 rows and 0 columns Presolve time: 0.34s Presolved: 52460 rows, 54834 columns, 212886 nonzeros Variable types: 54760 continuous, 74 integer (74 binary) Root relaxation: objective 8.901591e+04, 11618 iterations, 2.21 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 89015.9083 0 2 - 89015.9083 - - 2s H 0 0 89866.000000 89015.9083 0.95% - 2s H 0 0 89669.000000 89015.9083 0.73% - 2s 0 0 89016.5721 0 3 89669.0000 89016.5721 0.73% - 3s 0 0 89016.5721 0 3 89669.0000 89016.5721 0.73% - 3s 0 0 89016.5721 0 2 89669.0000 89016.5721 0.73% - 8s 0 0 89016.5845 0 3 89669.0000 89016.5845 0.73% - 8s 0 0 89016.5845 0 3 89669.0000 89016.5845 0.73% - 9s H 0 0 89512.000000 89016.5845 0.55% - 9s 0 2 89018.1818 0 3 89512.0000 89018.1818 0.55% - 11s * 18 1 6 89462.000000 89456.0000 0.01% 150 12s Cutting planes: Gomory: 1 Flow cover: 2 Explored 19 nodes (22895 simplex iterations) in 12.95 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.946200000000e+04, best bound 8.945600000000e+04, gap 0.0067%