
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 02:44:09 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo1456.29.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/grafo1456.29.lp
Reading time = 0.31 seconds
: 186016 rows, 1570 columns, 559425 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 186016 rows, 1570 columns and 559425 nonzeros
Model fingerprint: 0x307017ea
Variable types: 39 continuous, 1531 integer (1531 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 87540 rows and 12 columns
Presolve time: 1.38s
Presolved: 98476 rows, 1558 columns, 297027 nonzeros
Variable types: 0 continuous, 1558 integer (1519 binary)
Found heuristic solution: objective 5.0000000
Root relaxation presolved: 1558 rows, 100034 columns, 298585 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0         39    -infinity     -0.0000000e+00      2s
       1       2988  -3.7816383e+02  -8.2039131e-02      2s
       2       6739  -3.5222971e+02  -2.5008535e-01      2s
       3      10369  -3.4421084e+02  -2.6485777e-01      3s
       4      14005  -3.4407047e+02  -3.3198920e-01      3s
       5      17179  -3.4352380e+02  -3.5806556e-01      3s
       6      20480  -3.4337589e+02  -3.8827715e-01      4s
       7      23853  -3.4325451e+02  -6.8633999e-01      4s
       8      26587  -3.4322476e+02  -1.5361324e+00      4s
       9      28956  -9.9851661e+01  -1.5439043e+00      5s
      10      30698  -6.1375223e+01  -1.5505985e+00      5s
      11      32282  -5.1025948e+01  -1.5605942e+00      5s
      12      33851  -5.1025948e+01  -1.5641951e+00      5s
      13      35636  -5.1025948e+01  -1.5937430e+00      5s
      14      37270  -5.1025948e+01  -1.6044163e+00      5s

Sifting complete


Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
   39520    5.1000000e+01   0.000000e+00   9.061547e+02      5s
   71161    5.1000000e+01   0.000000e+00   0.000000e+00     10s
   71161    5.1000000e+01   0.000000e+00   0.000000e+00     10s

Root relaxation: objective 5.100000e+01, 71161 iterations, 8.44 seconds (6.66 work units)
Total elapsed time = 10.21s (DegenMoves)
Total elapsed time = 18.99s (DegenMoves)
Total elapsed time = 20.43s (DegenMoves)

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

     0     0   51.00000    0  433    5.00000   51.00000   920%     -   23s
H    0     0                       9.0000000   51.00000   467%     -   23s
     0     0   51.00000    0  721    9.00000   51.00000   467%     -   36s
     0     0   51.00000    0  674    9.00000   51.00000   467%     -   38s
     0     0   51.00000    0  654    9.00000   51.00000   467%     -   50s

Cutting planes:
  Gomory: 3
  Lift-and-project: 41
  Cover: 17
  Clique: 33
  MIR: 131
  Zero half: 27
  RLT: 79
  BQP: 4

Explored 1 nodes (89200 simplex iterations) in 50.08 seconds (55.07 work units)
Thread count was 8 (of 8 available processors)

Solution count 3: 9 5 -0 

Time limit reached
Best objective 9.000000000000e+00, best bound 5.100000000000e+01, gap 466.6667%

Wrote result file './lp_solutions/grafo1456.29.sol'

