
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 01:22:15 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo2846.21.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/grafo2846.21.lp
Reading time = 0.41 seconds
: 249195 rows, 895 columns, 748286 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 249195 rows, 895 columns and 748286 nonzeros
Model fingerprint: 0x30868b01
Variable types: 27 continuous, 868 integer (868 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 1.0000000
Presolve removed 128565 rows and 10 columns
Presolve time: 1.93s
Presolved: 120630 rows, 885 columns, 362700 nonzeros
Variable types: 0 continuous, 885 integer (858 binary)
Found heuristic solution: objective 7.0000000
Root relaxation presolved: 885 rows, 121515 columns, 363585 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0        188    -infinity     -1.0000000e+00      2s
       1       2236  -2.6144255e+02  -1.4614201e+01      3s
       2       3599  -1.8084667e+02  -1.5952507e+01      3s
       3       5033  -1.1278857e+02  -2.0431831e+01      3s
       4       6794  -7.0636250e+01  -2.2954234e+01      3s
       5       7718  -4.6680000e+01  -2.5033241e+01      3s
       6       8329  -3.5000000e+01  -2.6447888e+01      3s
       7       8899  -3.1000000e+01  -2.7714277e+01      3s
       8       9456  -3.1000000e+01  -2.8499536e+01      3s
       9      10009  -3.1000000e+01  -2.9176611e+01      3s
      10      10559  -3.1000000e+01  -2.9809648e+01      3s
      11      11106  -3.1000000e+01  -3.0149720e+01      3s

Sifting complete


Root relaxation: objective 3.100000e+01, 11651 iterations, 1.21 seconds (1.12 work units)
Total elapsed time = 9.99s (DegenMoves)
Total elapsed time = 10.93s (DegenMoves)
Total elapsed time = 15.28s (DegenMoves)

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

     0     0   31.00000    0  329    7.00000   31.00000   343%     -   16s
     0     0   31.00000    0  349    7.00000   31.00000   343%     -   23s
     0     0   31.00000    0  338    7.00000   31.00000   343%     -   24s
     0     0   31.00000    0  350    7.00000   31.00000   343%     -   42s
     0     0   31.00000    0  311    7.00000   31.00000   343%     -   44s
     0     0   31.00000    0  265    7.00000   31.00000   343%     -   50s

Cutting planes:
  Cover: 11
  Clique: 33
  MIR: 58
  StrongCG: 1
  GUB cover: 1
  Zero half: 139
  RLT: 40
  BQP: 1

Explored 1 nodes (29962 simplex iterations) in 50.05 seconds (60.49 work units)
Thread count was 8 (of 8 available processors)

Solution count 2: 7 1 

Time limit reached
Best objective 7.000000000000e+00, best bound 3.100000000000e+01, gap 342.8571%

Wrote result file './lp_solutions/grafo2846.21.sol'

