Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:08 2012 Optimize a model with 531 rows, 144 columns and 1062 nonzeros Presolve removed 94 rows and 0 columns Presolve time: 0.01s Presolved: 437 rows, 144 columns, 931 nonzeros Variable types: 0 continuous, 144 integer (144 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 5.975000e+01, 287 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 59.75000 0 111 47.00000 59.75000 27.1% - 0s 0 0 58.83333 0 139 47.00000 58.83333 25.2% - 0s 0 0 57.85714 0 137 47.00000 57.85714 23.1% - 0s 0 0 57.60000 0 135 47.00000 57.60000 22.6% - 0s 0 0 57.51279 0 142 47.00000 57.51279 22.4% - 0s 0 0 57.18269 0 141 47.00000 57.18269 21.7% - 0s 0 0 56.70263 0 143 47.00000 56.70263 20.6% - 0s 0 0 56.52421 0 141 47.00000 56.52421 20.3% - 0s H 0 0 48.0000000 56.52421 17.8% - 0s 0 0 56.41048 0 141 48.00000 56.41048 17.5% - 0s 0 0 56.31260 0 142 48.00000 56.31260 17.3% - 0s 0 0 56.23101 0 139 48.00000 56.23101 17.1% - 0s 0 0 56.16108 0 142 48.00000 56.16108 17.0% - 0s 0 0 56.08151 0 140 48.00000 56.08151 16.8% - 0s 0 0 56.01187 0 142 48.00000 56.01187 16.7% - 0s 0 0 55.94390 0 143 48.00000 55.94390 16.5% - 0s 0 0 55.84800 0 142 48.00000 55.84800 16.3% - 0s 0 0 55.83733 0 144 48.00000 55.83733 16.3% - 0s 0 0 55.83733 0 144 48.00000 55.83733 16.3% - 0s H 0 0 49.0000000 55.83733 14.0% - 0s 0 2 55.83486 0 144 49.00000 55.83486 13.9% - 0s H 27 19 50.0000000 55.60855 11.2% 50.7 0s H 64 27 51.0000000 54.95318 7.75% 44.5 0s Cutting planes: Zero half: 172 Explored 493 nodes (19354 simplex iterations) in 0.80 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%