Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:19:26 2012 Optimize a model with 790 rows, 177 columns and 1580 nonzeros Presolve removed 189 rows and 0 columns Presolve time: 0.01s Presolved: 601 rows, 177 columns, 1316 nonzeros Variable types: 0 continuous, 177 integer (177 binary) Found heuristic solution: objective 56.0000000 Root relaxation: objective 6.956897e+01, 409 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 69.56897 0 169 56.00000 69.56897 24.2% - 0s 0 0 68.97054 0 176 56.00000 68.97054 23.2% - 0s 0 0 68.64112 0 174 56.00000 68.64112 22.6% - 0s 0 0 68.22917 0 176 56.00000 68.22917 21.8% - 0s H 0 0 57.0000000 68.22917 19.7% - 0s 0 0 67.96259 0 173 57.00000 67.96259 19.2% - 0s H 0 0 58.0000000 67.96259 17.2% - 0s 0 0 67.66308 0 175 58.00000 67.66308 16.7% - 0s 0 0 67.46209 0 175 58.00000 67.46209 16.3% - 0s 0 0 67.27940 0 175 58.00000 67.27940 16.0% - 0s 0 0 67.16897 0 175 58.00000 67.16897 15.8% - 0s 0 0 67.10542 0 175 58.00000 67.10542 15.7% - 0s 0 0 67.03177 0 177 58.00000 67.03177 15.6% - 0s 0 0 67.01036 0 177 58.00000 67.01036 15.5% - 0s 0 0 67.01036 0 176 58.00000 67.01036 15.5% - 0s 0 2 67.00326 0 176 58.00000 67.00326 15.5% - 0s H 9 9 59.0000000 66.82922 13.3% 88.2 0s * 12 12 7 61.0000000 66.82922 9.56% 79.9 0s Cutting planes: Zero half: 105 Explored 701 nodes (30857 simplex iterations) in 1.35 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.100000000000e+01, best bound 6.100000000000e+01, gap 0.0%