
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 01:30:16 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo1624.23.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/grafo1624.23.lp
Reading time = 0.48 seconds
: 283497 rows, 1100 columns, 851396 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 283497 rows, 1100 columns and 851396 nonzeros
Model fingerprint: 0xda69abb8
Variable types: 30 continuous, 1070 integer (1070 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 145589 rows and 1 columns
Presolve time: 1.97s
Presolved: 137908 rows, 1099 columns, 414797 nonzeros
Variable types: 0 continuous, 1099 integer (1069 binary)
Found heuristic solution: objective 8.0000000
Root relaxation presolved: 1091 rows, 138999 columns, 415896 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0         30    -infinity     -0.0000000e+00      3s
       1       1239  -2.8612500e+08  -1.9075000e+01      3s
       2       1875  -1.1250340e+06  -1.9675008e+01      3s
       3       2419  -3.7000000e+01  -2.1776528e+01      3s
       4       2774  -3.7000000e+01  -2.3977144e+01      3s
       5       3093  -3.7000000e+01  -3.3677345e+01      3s

Sifting complete


Root relaxation: objective 3.700000e+01, 3392 iterations, 0.64 seconds (0.57 work units)
Total elapsed time = 9.43s (DegenMoves)
Total elapsed time = 10.45s (DegenMoves)

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

     0     0   37.00000    0  394    8.00000   37.00000   362%     -   14s
     0     0   37.00000    0  571    8.00000   37.00000   362%     -   26s
     0     0   37.00000    0  555    8.00000   37.00000   362%     -   27s
     0     0   37.00000    0  322    8.00000   37.00000   362%     -   46s
     0     0   37.00000    0  308    8.00000   37.00000   362%     -   48s

Cutting planes:
  Cover: 41
  Clique: 37
  MIR: 79
  StrongCG: 2
  RLT: 12
  BQP: 3

Explored 1 nodes (19130 simplex iterations) in 50.04 seconds (59.13 work units)
Thread count was 8 (of 8 available processors)

Solution count 2: 8 -0 

Time limit reached
Best objective 8.000000000000e+00, best bound 3.700000000000e+01, gap 362.5000%

Wrote result file './lp_solutions/grafo1624.23.sol'

