Gurobi 5.0.1 (linux64) logging started Mon Feb 4 16:21:34 2013 Optimize a model with 1091 rows, 20592 columns and 965128 nonzeros Presolve removed 6 rows and 6 columns (presolve time = 5s) ... Presolve removed 12 rows and 12 columns (presolve time = 11s) ... Presolve removed 38 rows and 92 columns (presolve time = 15s) ... Presolve removed 38 rows and 169 columns Presolve time: 17.19s Presolved: 1053 rows, 20423 columns, 958014 nonzeros Variable types: 0 continuous, 20423 integer (20423 binary) Found heuristic solution: objective 10536.000000 Root relaxation: objective 7.317000e+03, 4583 iterations, 1.72 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 7317.00000 0 146 10536.0000 7317.00000 30.6% - 19s H 0 0 7373.0000000 7317.00000 0.76% - 20s 0 0 7330.16667 0 72 7373.00000 7330.16667 0.58% - 22s H 0 0 7367.0000000 7330.16667 0.50% - 26s 0 0 7330.16667 0 54 7367.00000 7330.16667 0.50% - 28s H 0 0 7360.0000000 7330.16667 0.41% - 28s 0 0 7331.00000 0 92 7360.00000 7331.00000 0.39% - 28s 0 0 7332.20000 0 50 7360.00000 7332.20000 0.38% - 30s 0 2 7332.60000 0 50 7360.00000 7332.60000 0.37% - 32s H 1 1 7359.0000000 7332.60000 0.36% 335 41s H 5 4 7354.0000000 7338.00000 0.22% 67.0 45s H 9 6 7353.0000000 7340.36979 0.17% 595 56s * 12 8 29 7343.0000000 7343.00000 0.0% 446 57s Cutting planes: Gomory: 2 Clique: 6 Zero half: 5 Explored 12 nodes (19877 simplex iterations) in 57.77 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.343000000000e+03, best bound 7.343000000000e+03, gap 0.0%