
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 05:58:59 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo6003.37.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/grafo6003.37.lp
Reading time = 0.29 seconds
: 178254 rows, 1962 columns, 536402 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 178254 rows, 1962 columns and 536402 nonzeros
Model fingerprint: 0x9b35fd0d
Variable types: 43 continuous, 1919 integer (1919 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 74597 rows and 22 columns
Presolve time: 1.40s
Presolved: 103657 rows, 1940 columns, 312871 nonzeros
Variable types: 0 continuous, 1940 integer (1897 binary)
Found heuristic solution: objective 7.0000000
Root relaxation presolved: 1940 rows, 105597 columns, 314811 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0        292    -infinity     -1.0000698e+00      2s
       1       1795  -3.7448160e+02  -1.0821848e+00      2s
       2       3339  -3.5095145e+02  -1.1785881e+00      2s
       3       4932  -3.4761854e+02  -1.3033905e+00      2s
       4       6183  -3.4761854e+02  -1.3847225e+00      2s
       5       7233  -7.6040229e+01  -1.4152228e+00      2s
       6       8412  -4.6525112e+01  -1.4361291e+00      2s
       7       9968  -4.6025322e+01  -1.4436531e+00      2s
       8      11640  -4.6025322e+01  -1.4485215e+00      2s
       9      13576  -4.6025322e+01  -1.4773513e+00      2s
      10      15770  -4.6025322e+01  -1.5016647e+00      3s
      11      17795  -4.6025322e+01  -1.5099527e+00      3s

Sifting complete


Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
   33195    4.5994981e+01   0.000000e+00   5.359767e+03      5s
   52374    4.6000000e+01   0.000000e+00   0.000000e+00      9s
   52374    4.6000000e+01   0.000000e+00   0.000000e+00      9s

Root relaxation: objective 4.600000e+01, 52374 iterations, 7.35 seconds (5.75 work units)
Total elapsed time = 24.76s (DegenMoves)
Total elapsed time = 27.59s (DegenMoves)

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

     0     0   46.00000    0  673    7.00000   46.00000   557%     -   31s
H    0     0                       8.0000000   46.00000   475%     -   31s
     0     0          -    0         8.00000   46.00000   475%     -   50s

Cutting planes:
  Gomory: 25
  Cover: 34
  Clique: 50
  MIR: 183
  StrongCG: 1
  GUB cover: 5
  Zero half: 44
  RLT: 75
  BQP: 8

Explored 1 nodes (74968 simplex iterations) in 50.02 seconds (55.76 work units)
Thread count was 8 (of 8 available processors)

Solution count 3: 8 7 1 

Time limit reached
Best objective 8.000000000000e+00, best bound 4.600000000000e+01, gap 475.0000%

Wrote result file './lp_solutions/grafo6003.37.sol'

