Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:19:29 2012 Optimize a model with 7991 rows, 2970 columns and 26674 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.16s Presolved: 8043 rows, 2968 columns, 29294 nonzeros Variable types: 0 continuous, 2968 integer (2968 binary) Found heuristic solution: objective 54.0000000 Root relaxation: objective 2.000000e+00, 2151 iterations, 0.05 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 106 54.00000 2.00000 96.3% - 0s H 0 0 49.0000000 2.00000 95.9% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 2.66667 0 2507 4.00000 2.66667 33.3% - 1s 0 0 2.67532 0 2490 4.00000 2.67532 33.1% - 2s 0 0 2.67532 0 2486 4.00000 2.67532 33.1% - 3s 0 0 2.67532 0 2482 4.00000 2.67532 33.1% - 3s 0 0 2.67532 0 2475 4.00000 2.67532 33.1% - 3s 0 0 2.67532 0 2486 4.00000 2.67532 33.1% - 4s 0 0 2.67532 0 2098 4.00000 2.67532 33.1% - 9s 0 0 2.67532 0 1848 4.00000 2.67532 33.1% - 13s 0 0 3.00000 0 115 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 130 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 96 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 114 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 123 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 108 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 120 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 122 4.00000 3.00000 25.0% - 15s 0 0 3.00000 0 122 4.00000 3.00000 25.0% - 15s 0 2 3.00000 0 76 4.00000 3.00000 25.0% - 15s Cutting planes: Gomory: 9 Clique: 1 Zero half: 6 Explored 20 nodes (54399 simplex iterations) in 15.96 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%