Gurobi 5.0.1 (linux64) logging started Fri Nov 16 04:18:37 2012

Optimize a model with 7349 rows, 2550 columns and 24348 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.13s
Presolved: 7347 rows, 2548 columns, 24054 nonzeros
Variable types: 0 continuous, 2548 integer (2548 binary)
Found heuristic solution: objective 50.0000000

Root relaxation: objective 2.000000e+00, 1936 iterations, 0.06 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0    2.00000    0  100   50.00000    2.00000  96.0%     -    0s
H    0     0                       4.0000000    2.00000  50.0%     -    0s
     0     0    2.66667    0  228    4.00000    2.66667  33.3%     -    0s
     0     0    2.68085    0 2206    4.00000    2.68085  33.0%     -    1s
     0     0    2.68085    0 2217    4.00000    2.68085  33.0%     -    2s
     0     0    2.68085    0 1958    4.00000    2.68085  33.0%     -    3s
     0     0    2.68085    0 2015    4.00000    2.68085  33.0%     -    4s
     0     0    2.68085    0 2013    4.00000    2.68085  33.0%     -    4s
     0     0    2.68085    0 2007    4.00000    2.68085  33.0%     -    5s
     0     0    2.68085    0 1991    4.00000    2.68085  33.0%     -    6s
     0     0    2.68085    0 1982    4.00000    2.68085  33.0%     -    7s
     0     0    2.68085    0 2006    4.00000    2.68085  33.0%     -    8s
     0     0    2.68085    0 1969    4.00000    2.68085  33.0%     -    9s
     0     0    2.68085    0 2030    4.00000    2.68085  33.0%     -    9s
     0     0    2.68085    0 2030    4.00000    2.68085  33.0%     -   10s
     0     1    3.00000    0 2030    4.00000    3.00000  25.0%     -   11s

Cutting planes:
  Clique: 99
  Zero half: 7

Explored 8 nodes (35798 simplex iterations) in 11.67 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%