
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 04:55:58 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo2207.36.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/grafo2207.36.lp
Reading time = 0.35 seconds
: 213538 rows, 1966 columns, 642309 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 213538 rows, 1966 columns and 642309 nonzeros
Model fingerprint: 0x8659dc26
Variable types: 44 continuous, 1922 integer (1922 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 93382 rows and 24 columns
Presolve time: 1.67s
Presolved: 120156 rows, 1942 columns, 362341 nonzeros
Variable types: 0 continuous, 1942 integer (1898 binary)
Found heuristic solution: objective 8.0000000
Root relaxation presolved: 1942 rows, 122098 columns, 364283 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0        250    -infinity     -1.0000000e+00      2s
       1       2795  -3.9702303e+02  -1.0638549e+00      2s
       2       5480  -3.7103049e+02  -1.2070977e+00      2s
       3       7473  -3.6263832e+02  -1.3610006e+00      2s
       4       9224  -3.6243884e+02  -1.5142589e+00      3s
       5      10800  -3.6243884e+02  -1.6862324e+00      3s
       6      12766  -9.9881513e+01  -1.6878115e+00      3s
       7      14574  -6.5874114e+01  -1.7153880e+00      3s
       8      16366  -5.2023739e+01  -1.7170512e+00      3s
       9      18084  -5.1024771e+01  -1.7190489e+00      3s
      10      19942  -4.9026415e+01  -1.7392225e+00      3s
      11      21691  -4.9026415e+01  -1.7448598e+00      3s
      12      23546  -4.9026415e+01  -1.7568590e+00      3s
      13      25325  -4.9026415e+01  -1.7623275e+00      3s

Sifting complete


Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
   37577    4.8970055e+01   0.000000e+00   8.362604e+03      5s
   64929    4.8954730e+01   0.000000e+00   3.230233e+03     10s
   92207    4.8952676e+01   0.000000e+00   1.412968e+01     15s
   96679    4.9000000e+01   0.000000e+00   0.000000e+00     16s
   96679    4.9000000e+01   0.000000e+00   0.000000e+00     16s

Root relaxation: objective 4.900000e+01, 96679 iterations, 14.09 seconds (10.41 work units)
Total elapsed time = 34.42s (DegenMoves)
Total elapsed time = 36.67s (DegenMoves)

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

     0     0   49.00000    0  546    8.00000   49.00000   512%     -   37s
     0     0          -    0         8.00000   49.00000   512%     -   50s

Cutting planes:
  Gomory: 10
  Cover: 48
  Clique: 53
  MIR: 220
  StrongCG: 3
  GUB cover: 9
  Zero half: 67
  RLT: 102
  BQP: 2

Explored 1 nodes (113104 simplex iterations) in 50.02 seconds (49.63 work units)
Thread count was 8 (of 8 available processors)

Solution count 2: 8 1 

Time limit reached
Best objective 8.000000000000e+00, best bound 4.900000000000e+01, gap 512.5000%

Wrote result file './lp_solutions/grafo2207.36.sol'

