Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:52 2012 Optimize a model with 571 rows, 147 columns and 1142 nonzeros Presolve removed 123 rows and 2 columns Presolve time: 0.00s Presolved: 448 rows, 145 columns, 968 nonzeros Variable types: 0 continuous, 145 integer (145 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 6.075000e+01, 261 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 0 127 51.00000 60.75000 19.1% - 0s 0 0 59.92781 0 140 51.00000 59.92781 17.5% - 0s 0 0 59.00000 0 140 51.00000 59.00000 15.7% - 0s 0 0 58.53061 0 142 51.00000 58.53061 14.8% - 0s 0 0 57.91892 0 140 51.00000 57.91892 13.6% - 0s 0 0 57.64879 0 139 51.00000 57.64879 13.0% - 0s H 0 0 52.0000000 57.64879 10.9% - 0s H 0 0 53.0000000 57.64879 8.77% - 0s 0 0 57.51143 0 139 53.00000 57.51143 8.51% - 0s 0 0 57.38612 0 142 53.00000 57.38612 8.28% - 0s 0 0 57.28044 0 138 53.00000 57.28044 8.08% - 0s 0 0 57.21959 0 139 53.00000 57.21959 7.96% - 0s 0 0 57.11236 0 138 53.00000 57.11236 7.76% - 0s 0 0 57.08534 0 140 53.00000 57.08534 7.71% - 0s 0 0 57.08534 0 139 53.00000 57.08534 7.71% - 0s 0 2 57.08287 0 139 53.00000 57.08287 7.70% - 0s * 78 10 8 54.0000000 55.71014 3.17% 40.9 0s Cutting planes: Gomory: 1 Zero half: 78 Explored 93 nodes (4608 simplex iterations) in 0.24 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.400000000000e+01, best bound 5.400000000000e+01, gap 0.0%