Gurobi 5.0.1 (linux64) logging started Mon Feb 4 17:42:32 2013 Optimize a model with 1640 rows, 51718 columns and 2321449 nonzeros Presolve removed 34 rows and 273 columns (presolve time = 5s) ... Presolve removed 34 rows and 308 columns Presolve time: 7.41s Presolved: 1606 rows, 51410 columns, 2305057 nonzeros Variable types: 0 continuous, 51410 integer (51410 binary) Found heuristic solution: objective 26603.000000 Root simplex log... Iteration Objective Primal Inf. Dual Inf. Time 8706 1.7593831e+04 2.205357e+03 0.000000e+00 5s 12732 1.7746044e+04 1.056957e+03 0.000000e+00 10s 15387 1.7767937e+04 0.000000e+00 0.000000e+00 14s Root relaxation: objective 1.776794e+04, 15387 iterations, 14.46 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 17767.9375 0 124 26603.0000 17767.9375 33.2% - 23s H 0 0 18932.000000 17767.9375 6.15% - 24s H 0 0 18890.000000 17767.9375 5.94% - 24s 0 0 17772.0000 0 60 18890.0000 17772.0000 5.92% - 31s 0 0 17773.0000 0 58 18890.0000 17773.0000 5.91% - 33s H 0 0 17999.000000 17773.0000 1.26% - 34s 0 0 17773.3662 0 158 17999.0000 17773.3662 1.25% - 36s 0 0 17773.3662 0 124 17999.0000 17773.3662 1.25% - 63s 0 0 17773.5000 0 119 17999.0000 17773.5000 1.25% - 66s 0 0 17774.3333 0 92 17999.0000 17774.3333 1.25% - 70s 0 0 17774.7073 0 141 17999.0000 17774.7073 1.25% - 73s H 0 0 17851.000000 17774.7073 0.43% - 75s * 0 0 0 17776.000000 17776.0000 0.0% - 77s Cutting planes: Clique: 21 Zero half: 20 Explored 0 nodes (35100 simplex iterations) in 77.30 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.777600000000e+04, best bound 1.777600000000e+04, gap 0.0%