Gurobi 5.0.1 (linux64) logging started Wed Apr 24 03:18:15 2013 Optimize a model with 61698 rows, 60918 columns and 243438 nonzeros Presolve removed 4067 rows and 0 columns Presolve time: 0.39s Presolved: 57631 rows, 60918 columns, 235304 nonzeros Variable types: 60840 continuous, 78 integer (78 binary) Root relaxation: objective 8.919571e+04, 12417 iterations, 2.56 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 89195.7115 0 4 - 89195.7115 - - 3s H 0 0 90950.000000 89195.7115 1.93% - 3s 0 0 89196.0691 0 5 90950.0000 89196.0691 1.93% - 3s H 0 0 89700.762500 89196.0691 0.56% - 5s H 0 0 89526.000000 89196.0691 0.37% - 5s 0 0 89196.0691 0 4 89526.0000 89196.0691 0.37% - 7s 0 0 89196.1301 0 6 89526.0000 89196.1301 0.37% - 8s 0 0 89197.1966 0 5 89526.0000 89197.1966 0.37% - 8s 0 2 89209.8469 0 5 89526.0000 89209.8469 0.35% - 9s 4 5 89283.2946 4 1 89526.0000 89283.2946 0.27% 76.8 10s H 10 3 89366.000000 89294.2938 0.08% 43.4 10s * 16 1 13 89344.000000 89294.2938 0.06% 32.2 10s Cutting planes: Gomory: 1 Flow cover: 2 Explored 18 nodes (18674 simplex iterations) in 10.39 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.934400000000e+04, best bound 8.934400000000e+04, gap 0.0%