
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 02:16:03 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo1221.27.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/grafo1221.27.lp
Reading time = 0.19 seconds
: 116145 rows, 1242 columns, 349448 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 116145 rows, 1242 columns and 349448 nonzeros
Model fingerprint: 0xfd3bb050
Variable types: 34 continuous, 1208 integer (1208 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 53241 rows and 12 columns
Presolve time: 0.86s
Presolved: 62904 rows, 1230 columns, 190033 nonzeros
Variable types: 0 continuous, 1230 integer (1196 binary)
Found heuristic solution: objective 5.0000000
Root relaxation presolved: 1230 rows, 64134 columns, 191263 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0        246    -infinity     -1.0625617e+00      1s
       1       2505  -2.5449783e+02  -1.1543469e+00      1s
       2       4702  -2.3780154e+02  -1.2979430e+00      1s
       3       6791  -2.3703598e+02  -1.3677122e+00      2s
       4       8822  -2.3633312e+02  -1.7122681e+00      2s
       5      10326  -2.3633312e+02  -2.2715760e+00      2s
       6      12791  -5.1630797e+01  -2.2762296e+00      2s
       7      14091  -3.7173869e+01  -2.3143195e+00      2s
       8      15416  -3.4018018e+01  -2.3701209e+00      2s
       9      16669  -3.4018018e+01  -2.4436482e+00      2s
      10      17976  -3.4018018e+01  -2.4813543e+00      2s
      11      19261  -3.4018018e+01  -2.5352487e+00      2s
      12      20604  -3.4018018e+01  -2.5438658e+00      2s

Sifting complete


Root relaxation: objective 3.400000e+01, 22984 iterations, 1.61 seconds (1.41 work units)
Total elapsed time = 7.05s (DegenMoves)

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

     0     0   34.00000    0  342    5.00000   34.00000   580%     -    9s
H    0     0                       6.0000000   34.00000   467%     -    9s
H    0     0                       8.0000000   34.00000   325%     -   10s
H    0     0                       9.0000000   34.00000   278%     -   10s
     0     0   34.00000    0  537    9.00000   34.00000   278%     -   15s
     0     0   34.00000    0  494    9.00000   34.00000   278%     -   16s
     0     0   34.00000    0  336    9.00000   34.00000   278%     -   28s
     0     0   34.00000    0  307    9.00000   34.00000   278%     -   29s
     0     0   34.00000    0  335    9.00000   34.00000   278%     -   46s
     0     0   34.00000    0  333    9.00000   34.00000   278%     -   47s
     0     0          -    0         9.00000   34.00000   278%     -   50s

Cutting planes:
  Gomory: 1
  Cover: 33
  Clique: 27
  MIR: 85
  StrongCG: 1
  GUB cover: 2
  Zero half: 143
  RLT: 43
  BQP: 3

Explored 1 nodes (55712 simplex iterations) in 50.08 seconds (53.25 work units)
Thread count was 8 (of 8 available processors)

Solution count 4: 9 8 6 5 

Time limit reached
Best objective 9.000000000000e+00, best bound 3.400000000000e+01, gap 277.7778%

Wrote result file './lp_solutions/grafo1221.27.sol'

