Gurobi 5.0.1 (linux64) logging started Mon Feb 4 17:56:38 2013 Optimize a model with 7806 rows, 1296 columns and 23976 nonzeros Presolve removed 1100 rows and 662 columns Presolve time: 0.06s Presolved: 6706 rows, 634 columns, 20708 nonzeros Variable types: 18 continuous, 616 integer (616 binary) Found heuristic solution: objective 23496.000000 Root relaxation: objective 1.707045e+04, 3367 iterations, 0.11 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 17070.4500 0 7 23496.0000 17070.4500 27.3% - 0s H 0 0 17108.000000 17070.4500 0.22% - 0s H 0 0 17076.000000 17070.4500 0.03% - 0s 0 0 17071.5169 0 17 17076.0000 17071.5169 0.03% - 0s 0 0 17071.5169 0 7 17076.0000 17071.5169 0.03% - 0s 0 0 17072.3176 0 15 17076.0000 17072.3176 0.02% - 0s H 0 0 17075.000000 17072.3176 0.02% - 0s 0 0 17072.9319 0 22 17075.0000 17072.9319 0.01% - 0s 0 1 17073.1379 0 22 17075.0000 17073.1379 0.01% - 0s Explored 3 nodes (3488 simplex iterations) in 0.25 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.707500000000e+04, best bound 1.707500000000e+04, gap 0.0%