Gurobi 5.0.1 (linux64) logging started Mon Feb 4 17:00:10 2013 Optimize a model with 1364 rows, 36003 columns and 1548781 nonzeros Presolve removed 47 rows and 289 columns (presolve time = 5s) ... Presolve removed 47 rows and 290 columns Presolve time: 6.66s Presolved: 1317 rows, 35713 columns, 1534251 nonzeros Variable types: 0 continuous, 35713 integer (35713 binary) Found heuristic solution: objective 18997.000000 Root simplex log... Iteration Objective Primal Inf. Dual Inf. Time 8652 1.2268176e+04 1.151452e+02 0.000000e+00 5s 9899 1.2275000e+04 0.000000e+00 0.000000e+00 7s Root relaxation: objective 1.227500e+04, 9899 iterations, 6.50 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 12275.0000 0 52 18997.0000 12275.0000 35.4% - 13s H 0 0 13224.000000 12275.0000 7.18% - 14s H 0 0 12919.000000 12275.0000 4.98% - 14s 0 0 12278.0000 0 54 12919.0000 12278.0000 4.96% - 16s * 0 0 0 12279.000000 12279.0000 0.0% - 18s Cutting planes: Clique: 6 Zero half: 5 Explored 0 nodes (10726 simplex iterations) in 18.75 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.227900000000e+04, best bound 1.227900000000e+04, gap 0.0%