
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 01:43:04 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo1158.24.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/grafo1158.24.lp
Reading time = 0.59 seconds
: 363259 rows, 1159 columns, 1090780 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 363259 rows, 1159 columns and 1090780 nonzeros
Model fingerprint: 0xf71a60ec
Variable types: 31 continuous, 1128 integer (1128 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 184714 rows and 2 columns
Presolve time: 2.59s
Presolved: 178545 rows, 1157 columns, 536898 nonzeros
Variable types: 0 continuous, 1157 integer (1126 binary)
Found heuristic solution: objective 4.0000000
Root relaxation presolved: 1152 rows, 179697 columns, 538055 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0        226    -infinity     -1.0000000e+00      4s
       1       1512  -2.9475000e+08  -2.0650000e+01      4s
       2       2532  -7.5002900e+05  -2.1450021e+01      4s
       3       2890  -3.1000000e+01  -2.2723343e+01      4s
       4       3160  -3.1000000e+01  -2.4681466e+01      4s
       5       3456  -3.1000000e+01  -2.7118561e+01      4s
       6       3713  -3.1000000e+01  -3.0263967e+01      4s

Sifting complete


Root relaxation: objective 3.100000e+01, 3960 iterations, 0.83 seconds (0.80 work units)
Total elapsed time = 12.67s (DegenMoves)
Total elapsed time = 15.80s (DegenMoves)

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

     0     0   31.00000    0  398    4.00000   31.00000   675%     -   18s
     0     0   31.00000    0  466    4.00000   31.00000   675%     -   30s
     0     0   31.00000    0  446    4.00000   31.00000   675%     -   32s
     0     0   31.00000    0  491    4.00000   31.00000   675%     -   50s

Cutting planes:
  Gomory: 11
  Lift-and-project: 18
  Cover: 28
  Clique: 42
  MIR: 95
  GUB cover: 1
  Zero half: 14
  RLT: 75
  BQP: 9

Explored 1 nodes (16533 simplex iterations) in 50.05 seconds (56.56 work units)
Thread count was 8 (of 8 available processors)

Solution count 1: 4 

Time limit reached
Best objective 4.000000000000e+00, best bound 3.100000000000e+01, gap 675.0000%

Wrote result file './lp_solutions/grafo1158.24.sol'

