Gurobi 5.0.1 (linux64) logging started Mon Feb 4 18:54:51 2013 Optimize a model with 20875 rows, 2500 columns and 63750 nonzeros Presolve removed 1995 rows and 1265 columns Presolve time: 0.14s Presolved: 18880 rows, 1235 columns, 57860 nonzeros Variable types: 26 continuous, 1209 integer (1209 binary) Found heuristic solution: objective 46479.000000 Root relaxation: objective 3.285114e+04, 8132 iterations, 0.45 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 32851.1394 0 10 46479.0000 32851.1394 29.3% - 0s H 0 0 32871.000000 32851.1394 0.06% - 0s H 0 0 32868.000000 32851.1394 0.05% - 0s H 0 0 32860.000000 32851.1394 0.03% - 0s 0 0 32855.3735 0 27 32860.0000 32855.3735 0.01% - 0s 0 0 32855.3735 0 11 32860.0000 32855.3735 0.01% - 0s 0 0 32855.7480 0 29 32860.0000 32855.7480 0.01% - 0s 0 1 32855.7629 0 29 32860.0000 32855.7629 0.01% - 0s Cutting planes: Gomory: 14 Implied bound: 1 MIR: 15 Zero half: 11 Explored 5 nodes (8423 simplex iterations) in 0.87 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.286000000000e+04, best bound 3.285800000000e+04, gap 0.0061%