
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 01:58:14 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo2016.25.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/grafo2016.25.lp
Reading time = 0.18 seconds
: 113036 rows, 956 columns, 339774 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 113036 rows, 956 columns and 339774 nonzeros
Model fingerprint: 0xdbf10e51
Variable types: 28 continuous, 928 integer (928 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]
Presolve removed 54750 rows and 21 columns
Presolve time: 0.88s
Presolved: 58286 rows, 935 columns, 175711 nonzeros
Variable types: 0 continuous, 935 integer (907 binary)
Found heuristic solution: objective 3.0000000
Root relaxation presolved: 935 rows, 59221 columns, 176646 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0        318    -infinity     -2.0000493e+00      1s
       1       1510  -1.9786243e+02  -8.8197247e+00      1s
       2       2125  -1.9786243e+02  -9.5034178e+00      1s
       3       2983  -4.9003636e+01  -9.6133861e+00      1s
       4       4000  -3.0002017e+01  -9.6688411e+00      1s
       5       5052  -2.8001885e+01  -9.7389404e+00      1s
       6       5958  -2.8001885e+01  -1.0045247e+01      1s
       7       7221  -2.8001885e+01  -1.0047839e+01      2s
       8       8406  -2.8001885e+01  -1.0130911e+01      2s
       9       9591  -2.8001885e+01  -1.0397562e+01      2s
      10      10465  -2.8001885e+01  -1.0658314e+01      2s

Sifting complete


Root relaxation: objective 2.800000e+01, 13891 iterations, 1.06 seconds (0.83 work units)
Total elapsed time = 8.89s (DegenMoves)

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

     0     0   28.00000    0  287    3.00000   28.00000   833%     -    9s
H    0     0                       6.0000000   28.00000   367%     -    9s
     0     0   28.00000    0  354    6.00000   28.00000   367%     -   13s
     0     0   28.00000    0  353    6.00000   28.00000   367%     -   14s
     0     0   28.00000    0  206    6.00000   28.00000   367%     -   23s
     0     0   28.00000    0  210    6.00000   28.00000   367%     -   24s
H    0     0                       8.0000000   28.00000   250%     -   29s
     0     0   28.00000    0  172    8.00000   28.00000   250%     -   29s
H    0     0                       9.0000000   28.00000   211%     -   29s
     0     0   28.00000    0  161    9.00000   28.00000   211%     -   30s
     0     0   28.00000    0  270    9.00000   28.00000   211%     -   42s
     0     0   28.00000    0  234    9.00000   28.00000   211%     -   43s
     0     0   28.00000    0  364    9.00000   28.00000   211%     -   50s

Cutting planes:
  Cover: 25
  Clique: 19
  MIR: 113
  StrongCG: 3
  GUB cover: 3
  Zero half: 34
  RLT: 44

Explored 1 nodes (47777 simplex iterations) in 50.07 seconds (50.13 work units)
Thread count was 8 (of 8 available processors)

Solution count 4: 9 8 6 3 

Time limit reached
Best objective 9.000000000000e+00, best bound 2.800000000000e+01, gap 211.1111%

Wrote result file './lp_solutions/grafo2016.25.sol'

