
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 02:50:02 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo171.30.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/grafo171.30.lp
Reading time = 0.33 seconds
: 204969 rows, 1465 columns, 616129 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 204969 rows, 1465 columns and 616129 nonzeros
Model fingerprint: 0xedbdaca0
Variable types: 37 continuous, 1428 integer (1428 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 2.0000000
Presolve removed 102813 rows and 16 columns
Presolve time: 1.61s
Presolved: 102156 rows, 1449 columns, 307914 nonzeros
Variable types: 0 continuous, 1449 integer (1412 binary)
Found heuristic solution: objective 6.0000000
Root relaxation presolved: 1449 rows, 103605 columns, 309363 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0        272    -infinity     -2.0571429e+00      2s
       1       2522  -3.2971691e+02  -2.1821847e+00      2s
       2       5081  -3.1420530e+02  -2.3067208e+00      2s
       3       7496  -3.1246056e+02  -2.3882495e+00      3s
       4       9894  -3.1199880e+02  -2.4209198e+00      3s
       5      12343  -3.1199740e+02  -2.5199683e+00      3s
       6      14449  -6.2030277e+01  -2.5226352e+00      3s
       7      15824  -4.3186034e+01  -2.5269517e+00      3s
       8      17232  -3.8020457e+01  -2.5332078e+00      3s
       9      18723  -3.8020457e+01  -2.5448173e+00      3s
      10      20168  -3.8020457e+01  -2.5501021e+00      3s
      11      21760  -3.8020457e+01  -2.5543361e+00      3s
      12      23320  -3.8020457e+01  -2.5589385e+00      4s

Sifting complete


Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
   35119    3.7945258e+01   0.000000e+00   1.009085e+04      5s
   59715    3.8000000e+01   0.000000e+00   0.000000e+00      8s
   59715    3.8000000e+01   0.000000e+00   0.000000e+00      8s

Root relaxation: objective 3.800000e+01, 59715 iterations, 6.50 seconds (5.00 work units)
Total elapsed time = 14.94s (DegenMoves)
Total elapsed time = 25.94s (DegenMoves)
Total elapsed time = 30.13s (DegenMoves)

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

     0     0   38.00000    0  404    6.00000   38.00000   533%     -   31s
H    0     0                       7.0000000   38.00000   443%     -   31s
     0     0   38.00000    0  616    7.00000   38.00000   443%     -   41s
     0     0   38.00000    0  567    7.00000   38.00000   443%     -   42s
     0     0          -    0         7.00000   38.00000   443%     -   50s

Cutting planes:
  Gomory: 1
  Lift-and-project: 42
  Cover: 4
  Clique: 61
  MIR: 92
  GUB cover: 1
  Zero half: 18
  RLT: 73
  BQP: 10

Explored 1 nodes (81921 simplex iterations) in 50.02 seconds (62.57 work units)
Thread count was 8 (of 8 available processors)

Solution count 3: 7 6 2 

Time limit reached
Best objective 7.000000000000e+00, best bound 3.800000000000e+01, gap 442.8571%

Wrote result file './lp_solutions/grafo171.30.sol'

