Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:09:56 2012 Optimize a model with 744 rows, 173 columns and 1488 nonzeros Presolve removed 173 rows and 0 columns Presolve time: 0.00s Presolved: 571 rows, 173 columns, 1261 nonzeros Variable types: 0 continuous, 173 integer (173 binary) Found heuristic solution: objective 53.0000000 Root relaxation: objective 6.863333e+01, 349 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 68.63333 0 166 53.00000 68.63333 29.5% - 0s 0 0 67.35218 0 167 53.00000 67.35218 27.1% - 0s 0 0 67.05397 0 170 53.00000 67.05397 26.5% - 0s H 0 0 54.0000000 67.05397 24.2% - 0s 0 0 66.79889 0 170 54.00000 66.79889 23.7% - 0s H 0 0 55.0000000 66.79889 21.5% - 0s 0 0 66.42329 0 170 55.00000 66.42329 20.8% - 0s 0 0 66.27861 0 170 55.00000 66.27861 20.5% - 0s 0 0 65.94751 0 171 55.00000 65.94751 19.9% - 0s 0 0 65.61797 0 172 55.00000 65.61797 19.3% - 0s 0 0 65.48272 0 170 55.00000 65.48272 19.1% - 0s 0 0 65.29621 0 169 55.00000 65.29621 18.7% - 0s 0 0 65.27545 0 169 55.00000 65.27545 18.7% - 0s 0 0 65.27545 0 169 55.00000 65.27545 18.7% - 0s 0 2 65.27394 0 168 55.00000 65.27394 18.7% - 0s * 16 10 10 56.0000000 65.27275 16.6% 59.9 0s * 56 28 13 57.0000000 65.06361 14.1% 57.5 0s 940 307 59.50000 30 128 57.00000 62.69565 10.0% 48.2 5s * 2117 451 32 58.0000000 61.23529 5.58% 39.6 6s Cutting planes: Gomory: 2 Clique: 1 Zero half: 68 Explored 3412 nodes (120864 simplex iterations) in 8.52 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.800000000000e+01, best bound 5.800000000000e+01, gap 0.0%