Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:52:58 2012 Optimize a model with 688 rows, 166 columns and 1376 nonzeros Presolve removed 148 rows and 2 columns Presolve time: 0.00s Presolved: 540 rows, 164 columns, 1177 nonzeros Variable types: 0 continuous, 164 integer (164 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 6.700000e+01, 318 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 67.00000 0 132 50.00000 67.00000 34.0% - 0s 0 0 66.49198 0 160 50.00000 66.49198 33.0% - 0s 0 0 65.27243 0 162 50.00000 65.27243 30.5% - 0s 0 0 64.26538 0 163 50.00000 64.26538 28.5% - 0s H 0 0 53.0000000 64.26538 21.3% - 0s 0 0 63.92974 0 164 53.00000 63.92974 20.6% - 0s 0 0 63.56970 0 161 53.00000 63.56970 19.9% - 0s 0 0 63.49995 0 164 53.00000 63.49995 19.8% - 0s 0 0 63.38064 0 162 53.00000 63.38064 19.6% - 0s 0 0 63.09909 0 161 53.00000 63.09909 19.1% - 0s 0 0 62.97480 0 163 53.00000 62.97480 18.8% - 0s 0 0 62.94340 0 164 53.00000 62.94340 18.8% - 0s 0 0 62.94340 0 164 53.00000 62.94340 18.8% - 0s 0 2 62.94254 0 164 53.00000 62.94254 18.8% - 0s H 9 9 55.0000000 62.88639 14.3% 97.6 0s 612 224 56.65385 14 159 55.00000 60.47742 10.0% 41.6 5s * 762 240 36 56.0000000 60.47742 8.00% 49.7 8s 1468 239 57.97917 18 125 56.00000 59.31944 5.93% 44.1 10s Cutting planes: Zero half: 193 Explored 2284 nodes (90738 simplex iterations) in 11.86 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%