Gurobi 5.0.1 (linux64) logging started Mon Feb 4 17:28:05 2013 Optimize a model with 1878 rows, 57591 columns and 3084213 nonzeros Presolve removed 12 rows and 66 columns (presolve time = 5s) ... Presolve removed 34 rows and 340 columns (presolve time = 11s) ... Presolve removed 38 rows and 386 columns (presolve time = 15s) ... Presolve removed 39 rows and 420 columns Presolve time: 19.38s Presolved: 1839 rows, 57171 columns, 3060188 nonzeros Variable types: 0 continuous, 57171 integer (57171 binary) Found heuristic solution: objective 28786.000000 Root simplex log... Iteration Objective Primal Inf. Dual Inf. Time 7731 2.1223957e+04 5.104306e+02 0.000000e+00 5s 11721 2.1452210e+04 5.558376e+02 0.000000e+00 10s 14514 2.1503406e+04 2.662359e+02 0.000000e+00 15s 16056 2.1512500e+04 0.000000e+00 0.000000e+00 19s Root relaxation: objective 2.151250e+04, 16056 iterations, 19.28 seconds Total elapsed time = 40.02s Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 21512.5000 0 176 28786.0000 21512.5000 25.3% - 41s H 0 0 21768.000000 21512.5000 1.17% - 43s 0 0 21529.5000 0 62 21768.0000 21529.5000 1.10% - 49s H 0 0 21757.000000 21529.5000 1.05% - 72s 0 0 21529.5000 0 63 21757.0000 21529.5000 1.05% - 90s 0 0 21543.2857 0 197 21757.0000 21543.2857 0.98% - 94s 0 0 21546.2353 0 347 21757.0000 21546.2353 0.97% - 101s 0 0 21547.0000 0 231 21757.0000 21547.0000 0.97% - 108s * 0 0 0 21547.000000 21547.0000 0.0% - 113s Cutting planes: Clique: 27 Zero half: 25 Explored 0 nodes (36210 simplex iterations) in 113.43 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.154700000000e+04, best bound 2.154700000000e+04, gap 0.0000%