Gurobi 5.0.1 (linux64) logging started Mon Feb 4 17:22:03 2013 Optimize a model with 1796 rows, 53211 columns and 2803610 nonzeros Presolve removed 48 rows and 370 columns (presolve time = 6s) ... Presolve removed 49 rows and 390 columns Presolve time: 8.82s Presolved: 1747 rows, 52821 columns, 2782815 nonzeros Variable types: 0 continuous, 52821 integer (52821 binary) Found heuristic solution: objective 27054.000000 Root simplex log... Iteration Objective Primal Inf. Dual Inf. Time 8455 2.0390097e+04 5.058618e+02 0.000000e+00 5s 12196 2.0538944e+04 1.085955e+03 0.000000e+00 10s 14389 2.0562534e+04 6.376870e+01 0.000000e+00 15s 15145 2.0568500e+04 0.000000e+00 0.000000e+00 17s Root relaxation: objective 2.056850e+04, 15145 iterations, 16.87 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 20568.5000 0 56 27054.0000 20568.5000 24.0% - 28s H 0 0 22065.000000 20568.5000 6.78% - 28s H 0 0 21426.000000 20568.5000 4.00% - 46s 0 0 20573.0000 0 69 21426.0000 20573.0000 3.98% - 50s * 0 0 0 20578.000000 20578.0000 0.0% - 54s Cutting planes: Clique: 4 Zero half: 11 Explored 0 nodes (18478 simplex iterations) in 54.66 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.057800000000e+04, best bound 2.057800000000e+04, gap 0.0%