
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 05:18:41 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo6671.36.log"
Using license file /Users/sara/gurobi.lic
Academic license - for non-commercial use only - expires 2025-05-12

Gurobi Optimizer version 11.0.1 build v11.0.1rc0 (mac64[x86] - Darwin 21.6.0 21G651)
Copyright (c) 2024, Gurobi Optimization, LLC

Read LP format model from file ./lp_problems/grafo6671.36.lp
Reading time = 0.26 seconds
: 162654 rows, 1862 columns, 489456 nonzeros

CPU model: Intel(R) Core(TM) i5-1038NG7 CPU @ 2.00GHz
Thread count: 4 physical cores, 8 logical processors, using up to 8 threads

Optimize a model with 162654 rows, 1862 columns and 489456 nonzeros
Model fingerprint: 0x2e20e537
Variable types: 40 continuous, 1822 integer (1822 binary)
Coefficient statistics:
  Matrix range     [5e-01, 5e+01]
  Objective range  [1e+00, 1e+00]
  Bounds range     [1e+00, 1e+00]
  RHS range        [1e+00, 5e+01]
Found heuristic solution: objective -0.0000000
Presolve removed 69746 rows and 12 columns
Presolve time: 1.23s
Presolved: 92908 rows, 1850 columns, 280579 nonzeros
Variable types: 0 continuous, 1850 integer (1810 binary)
Found heuristic solution: objective 6.0000000
Root relaxation presolved: 1850 rows, 94758 columns, 282429 nonzeros


Starting sifting (using dual simplex for sub-problems)...

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0         40    -infinity     -0.0000000e+00      2s
       1       2805  -3.7044934e+02  -6.1726132e-02      2s
       2       6562  -3.4589412e+02  -1.5382434e-01      2s
       3      10495  -3.3125803e+02  -2.1021023e-01      3s
       4      14275  -3.2971923e+02  -2.5298971e-01      3s
       5      17923  -3.2843527e+02  -4.0736446e-01      4s
       6      21376  -3.2840063e+02  -8.1120112e-01      4s
       7      24360  -3.2839800e+02  -8.8604180e-01      4s
       8      27160  -9.0555033e+01  -8.8950296e-01      4s
       9      29644  -4.5296973e+01  -9.0241281e-01      5s
      10      31414  -4.2020251e+01  -9.1778493e-01      5s
      11      33167  -4.2020251e+01  -9.2102587e-01      5s
      12      35121  -4.2020251e+01  -9.2465593e-01      5s
      13      37024  -4.2020251e+01  -9.3082635e-01      5s

Sifting complete


Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
   39319    4.2000000e+01   0.000000e+00   2.515420e+02      5s
   68371    4.2000000e+01   0.000000e+00   0.000000e+00     10s
   68371    4.2000000e+01   0.000000e+00   0.000000e+00     10s

Root relaxation: objective 4.200000e+01, 68371 iterations, 8.43 seconds (7.08 work units)
Total elapsed time = 10.12s (DegenMoves)
Total elapsed time = 23.59s (DegenMoves)
Total elapsed time = 25.92s (DegenMoves)

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

     0     0   42.00000    0  497    6.00000   42.00000   600%     -   27s
H    0     0                       8.0000000   42.00000   425%     -   27s
     0     0   42.00000    0  763    8.00000   42.00000   425%     -   41s
H    0     0                       9.0000000   42.00000   367%     -   42s
     0     0   42.00000    0  752    9.00000   42.00000   367%     -   42s
     0     0          -    0         9.00000   42.00000   367%     -   50s

Cutting planes:
  Gomory: 2
  Lift-and-project: 37
  Cover: 20
  Clique: 33
  MIR: 115
  Zero half: 9
  RLT: 77
  BQP: 13

Explored 1 nodes (88093 simplex iterations) in 50.02 seconds (52.76 work units)
Thread count was 8 (of 8 available processors)

Solution count 4: 9 8 6 -0 

Time limit reached
Best objective 9.000000000000e+00, best bound 4.200000000000e+01, gap 366.6667%

Wrote result file './lp_solutions/grafo6671.36.sol'

