Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:37:06 2012 Optimize a model with 614 rows, 152 columns and 1228 nonzeros Presolve removed 160 rows and 2 columns Presolve time: 0.00s Presolved: 454 rows, 150 columns, 1004 nonzeros Variable types: 0 continuous, 150 integer (150 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.062500e+01, 291 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.62500 0 133 47.00000 60.62500 29.0% - 0s 0 0 59.75000 0 142 47.00000 59.75000 27.1% - 0s H 0 0 48.0000000 59.75000 24.5% - 0s 0 0 58.77340 0 148 48.00000 58.77340 22.4% - 0s H 0 0 49.0000000 58.77340 19.9% - 0s 0 0 58.59529 0 143 49.00000 58.59529 19.6% - 0s 0 0 58.50394 0 143 49.00000 58.50394 19.4% - 0s 0 0 58.25809 0 145 49.00000 58.25809 18.9% - 0s 0 0 58.03253 0 147 49.00000 58.03253 18.4% - 0s 0 0 57.84220 0 142 49.00000 57.84220 18.0% - 0s 0 0 57.76390 0 146 49.00000 57.76390 17.9% - 0s 0 0 57.74809 0 148 49.00000 57.74809 17.9% - 0s 0 0 57.74809 0 144 49.00000 57.74809 17.9% - 0s 0 2 57.74773 0 143 49.00000 57.74773 17.9% - 0s * 16 12 10 50.0000000 57.74740 15.5% 37.5 0s * 104 49 19 51.0000000 56.64356 11.1% 31.9 0s 615 192 53.72973 6 148 51.00000 54.86139 7.57% 28.7 5s * 1217 51 24 53.0000000 54.64706 3.11% 30.5 6s Cutting planes: Gomory: 3 Zero half: 62 Explored 1299 nodes (39565 simplex iterations) in 6.10 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%