Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:12 2012 Optimize a model with 567 rows, 145 columns and 1134 nonzeros Presolve removed 115 rows and 2 columns Presolve time: 0.00s Presolved: 452 rows, 143 columns, 974 nonzeros Variable types: 0 continuous, 143 integer (143 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 6.075000e+01, 279 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.75000 0 120 42.00000 60.75000 44.6% - 0s H 0 0 44.0000000 60.75000 38.1% - 0s 0 0 59.08333 0 139 44.00000 59.08333 34.3% - 0s H 0 0 49.0000000 59.08333 20.6% - 0s H 0 0 50.0000000 59.08333 18.2% - 0s 0 0 58.59836 0 141 50.00000 58.59836 17.2% - 0s 0 0 57.53496 0 140 50.00000 57.53496 15.1% - 0s 0 0 56.96643 0 142 50.00000 56.96643 13.9% - 0s 0 0 56.87786 0 142 50.00000 56.87786 13.8% - 0s 0 0 56.74483 0 142 50.00000 56.74483 13.5% - 0s 0 0 56.40387 0 141 50.00000 56.40387 12.8% - 0s 0 0 56.26086 0 140 50.00000 56.26086 12.5% - 0s 0 0 56.21682 0 140 50.00000 56.21682 12.4% - 0s 0 0 56.21682 0 140 50.00000 56.21682 12.4% - 0s 0 2 56.21393 0 139 50.00000 56.21393 12.4% - 0s * 79 35 14 51.0000000 55.59132 9.00% 41.9 0s H 145 23 52.0000000 55.15607 6.07% 37.9 0s Cutting planes: Gomory: 1 Zero half: 114 Explored 295 nodes (11577 simplex iterations) in 0.47 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%