current bounds on the number of colors: 0 -- 37 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:58:24 2012 Optimize a model with 6337 rows, 1016 columns and 19566 nonzeros Presolve time: 0.02s Presolved: 6337 rows, 1016 columns, 19566 nonzeros Variable types: 0 continuous, 1016 integer (1016 binary) Root relaxation: objective 0.000000e+00, 80 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (179 simplex iterations) in 0.04 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 18 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:58:24 2012 Optimize a model with 3187 rows, 683 columns and 9783 nonzeros Presolve time: 0.01s Presolved: 3187 rows, 683 columns, 9783 nonzeros Variable types: 0 continuous, 683 integer (683 binary) Root relaxation: objective 0.000000e+00, 78 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 16 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (480 simplex iterations) in 0.03 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 9 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:58:24 2012 Optimize a model with 1437 rows, 498 columns and 4348 nonzeros Presolve time: 0.00s Presolved: 1437 rows, 498 columns, 4348 nonzeros Variable types: 0 continuous, 498 integer (498 binary) Root relaxation: objective 0.000000e+00, 78 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 74 - 0.00000 - - 0s 0 0 0.00000 0 70 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1711 simplex iterations) in 0.18 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound 1.000000000000e+00, gap - current bounds on the number of colors: 4 -- 9 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:58:24 2012 Optimize a model with 2137 rows, 572 columns and 6522 nonzeros Presolve time: 0.01s Presolved: 2137 rows, 572 columns, 6522 nonzeros Variable types: 0 continuous, 572 integer (572 binary) Root relaxation: objective 0.000000e+00, 74 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 56 - 0.00000 - - 0s 0 0 0.00000 0 62 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1319 simplex iterations) in 0.12 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound 1.000000000000e+00, gap - current bounds on the number of colors: 6 -- 9 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:58:24 2012 Optimize a model with 2487 rows, 609 columns and 7609 nonzeros Presolve time: 0.01s Presolved: 2487 rows, 609 columns, 7609 nonzeros Variable types: 0 continuous, 609 integer (609 binary) Root relaxation: objective 0.000000e+00, 74 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 30 - 0.00000 - - 0s 0 0 0.00000 0 40 - 0.00000 - - 0s 0 0 0.00000 0 176 - 0.00000 - - 0s 0 0 0.00000 0 197 - 0.00000 - - 0s 0 0 0.00000 0 168 - 0.00000 - - 0s 0 0 0.00000 0 158 - 0.00000 - - 0s 0 0 0.00000 0 163 - 0.00000 - - 1s 0 0 0.00000 0 183 - 0.00000 - - 1s 0 0 0.00000 0 180 - 0.00000 - - 1s 0 2 0.00000 0 180 - 0.00000 - - 1s Cutting planes: Clique: 59 Zero half: 12 Explored 7 nodes (15305 simplex iterations) in 1.74 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - current bounds on the number of colors: 7 -- 9 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:58:26 2012 Optimize a model with 2837 rows, 646 columns and 8696 nonzeros Presolve time: 0.01s Presolved: 2837 rows, 646 columns, 8696 nonzeros Variable types: 0 continuous, 646 integer (646 binary) Root relaxation: objective 0.000000e+00, 77 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 32 - 0.00000 - - 0s 0 0 0.00000 0 28 - 0.00000 - - 0s * 0 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (3230 simplex iterations) in 0.23 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% optimal solution found: number of colors: 8