Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:00:58 2012 Optimize a model with 746 rows, 170 columns and 1492 nonzeros Presolve removed 164 rows and 0 columns Presolve time: 0.01s Presolved: 582 rows, 170 columns, 1274 nonzeros Variable types: 0 continuous, 170 integer (170 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 6.766667e+01, 375 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 67.66667 0 165 52.00000 67.66667 30.1% - 0s H 0 0 54.0000000 67.66667 25.3% - 0s 0 0 66.26344 0 169 54.00000 66.26344 22.7% - 0s 0 0 65.86246 0 167 54.00000 65.86246 22.0% - 0s H 0 0 55.0000000 65.86246 19.7% - 0s 0 0 65.54110 0 168 55.00000 65.54110 19.2% - 0s 0 0 65.29122 0 168 55.00000 65.29122 18.7% - 0s 0 0 65.06387 0 167 55.00000 65.06387 18.3% - 0s 0 0 64.95208 0 168 55.00000 64.95208 18.1% - 0s 0 0 64.74997 0 167 55.00000 64.74997 17.7% - 0s 0 0 64.70752 0 168 55.00000 64.70752 17.7% - 0s 0 0 64.61796 0 169 55.00000 64.61796 17.5% - 0s H 0 0 56.0000000 64.61796 15.4% - 0s 0 0 64.53071 0 167 56.00000 64.53071 15.2% - 0s 0 0 64.50754 0 165 56.00000 64.50754 15.2% - 0s 0 0 64.47596 0 167 56.00000 64.47596 15.1% - 0s 0 0 64.47596 0 165 56.00000 64.47596 15.1% - 0s 0 2 64.47297 0 165 56.00000 64.47297 15.1% - 0s H 108 48 57.0000000 63.62088 11.6% 45.0 0s 717 232 58.85714 22 126 57.00000 61.60938 8.09% 48.5 5s Cutting planes: Gomory: 5 Zero half: 61 Mod-K: 1 Explored 4356 nodes (136651 simplex iterations) in 9.87 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.700000000000e+01, best bound 5.700000000000e+01, gap 0.0%