Gurobi 5.0.1 (linux64) logging started Fri Nov 16 05:02:40 2012

Optimize a model with 7737 rows, 2862 columns and 25809 nonzeros
Presolve removed 2 rows and 2 columns
Presolve time: 0.14s
Presolved: 7788 rows, 2860 columns, 28326 nonzeros
Variable types: 0 continuous, 2860 integer (2860 binary)
Found heuristic solution: objective 53.0000000

Root relaxation: objective 2.000000e+00, 2191 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  106   53.00000    2.00000  96.2%     -    0s
H    0     0                      44.0000000    2.00000  95.5%     -    0s
H    0     0                       5.0000000    2.00000  60.0%     -    0s
     0     0    2.66667    0 1940    5.00000    2.66667  46.7%     -    0s
     0     0    2.66667    0 1811    5.00000    2.66667  46.7%     -    1s
     0     0    2.66667    0  945    5.00000    2.66667  46.7%     -    2s
     0     0    2.66667    0  473    5.00000    2.66667  46.7%     -    2s
H    0     0                       4.0000000    2.66667  33.3%     -    2s
     0     0    2.67105    0 2350    4.00000    2.67105  33.2%     -    2s
     0     0    2.67105    0 2338    4.00000    2.67105  33.2%     -    3s
     0     0    2.67105    0 2342    4.00000    2.67105  33.2%     -    3s
     0     0    2.67105    0 2100    4.00000    2.67105  33.2%     -    5s
     0     2    2.80000    0 2100    4.00000    2.80000  30.0%     -    6s

Cutting planes:
  Clique: 64
  Zero half: 5

Explored 15 nodes (17079 simplex iterations) in 7.12 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%