Gurobi 5.0.1 (linux64) logging started Mon Feb 4 18:21:56 2013 Optimize a model with 1840 rows, 63355 columns and 2950761 nonzeros Presolve removed 12 rows and 42 columns (presolve time = 5s) ... Presolve removed 12 rows and 42 columns Presolve time: 6.23s Presolved: 1828 rows, 63313 columns, 2947978 nonzeros Variable types: 0 continuous, 63313 integer (63313 binary) Found heuristic solution: objective 30493.000000 Root simplex log... Iteration Objective Primal Inf. Dual Inf. Time 7793 2.1592071e+04 1.873115e+03 0.000000e+00 5s 11621 2.1822705e+04 1.038296e+03 0.000000e+00 10s 14261 2.1863258e+04 3.308310e+02 0.000000e+00 15s 16362 2.1870750e+04 3.518505e+01 0.000000e+00 20s 16567 2.1870750e+04 0.000000e+00 0.000000e+00 21s Root relaxation: objective 2.187075e+04, 16567 iterations, 21.09 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 21870.7500 0 142 30493.0000 21870.7500 28.3% - 29s H 0 0 22006.000000 21870.7500 0.61% - 34s * 0 0 0 21873.000000 21873.0000 0.0% - 37s Cutting planes: Clique: 10 Zero half: 9 Explored 0 nodes (17976 simplex iterations) in 37.36 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.187299999999e+04, best bound 2.187299999999e+04, gap 0.0%