Gurobi 5.0.1 (linux64) logging started Wed Dec 19 14:03:16 2012 Optimize a model with 1762 rows, 1681 columns and 9981 nonzeros Presolve removed 1108 rows and 1215 columns Presolve time: 0.03s Presolved: 654 rows, 466 columns, 8568 nonzeros Variable types: 33 continuous, 433 integer (433 binary) Root relaxation: objective 5.316660e+02, 121 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 531.66604 0 25 - 531.66604 - - 0s 0 0 542.41022 0 29 - 542.41022 - - 0s 0 0 545.00000 0 24 - 545.00000 - - 0s 0 0 546.19444 0 28 - 546.19444 - - 0s 0 0 546.19444 0 28 - 546.19444 - - 0s 0 0 548.03889 0 24 - 548.03889 - - 0s 0 0 551.25806 0 19 - 551.25806 - - 0s 0 0 551.25806 0 19 - 551.25806 - - 0s H 0 0 557.0000000 551.25806 1.03% - 0s H 0 0 556.0000000 551.25806 0.85% - 0s 0 0 551.25806 0 12 556.00000 551.25806 0.85% - 0s H 0 0 552.0000000 551.25806 0.13% - 0s Explored 0 nodes (325 simplex iterations) in 0.15 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.520000000000e+02, best bound 5.520000000000e+02, gap 0.0%