Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:22:22 2013 Optimize a model with 31976 rows, 31416 columns and 125496 nonzeros Presolve removed 1381 rows and 0 columns Presolve time: 0.18s Presolved: 30595 rows, 31416 columns, 122734 nonzeros Variable types: 31360 continuous, 56 integer (56 binary) Root relaxation: objective 6.029908e+04, 6056 iterations, 0.85 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60299.0835 0 5 - 60299.0835 - - 1s H 0 0 61360.000000 60299.0835 1.73% - 1s H 0 0 61127.000000 60299.0835 1.35% - 1s H 0 0 60389.000000 60299.0835 0.15% - 1s 0 0 60299.7328 0 6 60389.0000 60299.7328 0.15% - 1s 0 0 60299.7600 0 6 60389.0000 60299.7600 0.15% - 1s 0 0 60299.9853 0 6 60389.0000 60299.9853 0.15% - 1s 0 0 60309.3423 0 2 60389.0000 60309.3423 0.13% - 2s 0 0 60309.3423 0 2 60389.0000 60309.3423 0.13% - 3s 0 0 60309.8160 0 4 60389.0000 60309.8160 0.13% - 3s 0 0 60309.9615 0 4 60389.0000 60309.9615 0.13% - 3s 0 2 60315.0096 0 4 60389.0000 60315.0096 0.12% - 3s Cutting planes: Gomory: 1 Flow cover: 3 Explored 3 nodes (8285 simplex iterations) in 3.80 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.038900000000e+04, best bound 6.038900000000e+04, gap 0.0%