
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 01:36:31 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo2551.23.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/grafo2551.23.lp
Reading time = 0.19 seconds
: 118432 rows, 968 columns, 356073 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 118432 rows, 968 columns and 356073 nonzeros
Model fingerprint: 0xae625a84
Variable types: 29 continuous, 939 integer (939 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 4.0000000
Presolve removed 64795 rows and 5 columns
Presolve time: 0.73s
Presolved: 53637 rows, 963 columns, 161910 nonzeros
Variable types: 0 continuous, 963 integer (934 binary)
Found heuristic solution: objective 8.0000000
Root relaxation presolved: 963 rows, 54600 columns, 162873 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0        320    -infinity     -4.7593068e+00      1s
       1       2302  -2.0191438e+02  -5.8507659e+00      1s
       2       3411  -1.6158326e+02  -6.5255621e+00      1s
       3       4732  -1.6158326e+02  -9.1179140e+00      1s
       4       6267  -7.1095044e+01  -9.1761815e+00      1s
       5       7980  -5.4689682e+01  -9.2077039e+00      1s
       6       9120  -3.7004018e+01  -9.2644968e+00      1s
       7      10200  -3.7004018e+01  -9.3352263e+00      2s
       8      11218  -3.7004018e+01  -9.4704896e+00      2s
       9      12560  -3.7004018e+01  -9.5026461e+00      2s
      10      13548  -3.7004018e+01  -9.6509044e+00      2s

Sifting complete


Root relaxation: objective 3.700000e+01, 18365 iterations, 1.33 seconds (1.09 work units)
Total elapsed time = 5.87s (DegenMoves)
Total elapsed time = 10.29s (DegenMoves)

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

     0     0   37.00000    0  386    8.00000   37.00000   362%     -   10s
H    0     0                       9.0000000   37.00000   311%     -   15s
     0     0   37.00000    0  446    9.00000   37.00000   311%     -   15s
H    0     0                      11.0000000   37.00000   236%     -   15s
     0     0   37.00000    0  463   11.00000   37.00000   236%     -   16s
     0     0   37.00000    0  362   11.00000   37.00000   236%     -   28s
     0     0   37.00000    0  350   11.00000   37.00000   236%     -   29s
     0     0   37.00000    0  366   11.00000   37.00000   236%     -   40s
     0     0   37.00000    0  389   11.00000   37.00000   236%     -   42s
     0     0   37.00000    0  353   11.00000   37.00000   236%     -   50s

Cutting planes:
  Gomory: 1
  Lift-and-project: 4
  Cover: 14
  Clique: 25
  MIR: 117
  Zero half: 44
  RLT: 69
  BQP: 1

Explored 1 nodes (56249 simplex iterations) in 50.06 seconds (57.14 work units)
Thread count was 8 (of 8 available processors)

Solution count 4: 11 9 8 4 

Time limit reached
Best objective 1.100000000000e+01, best bound 3.700000000000e+01, gap 236.3636%

Wrote result file './lp_solutions/grafo2551.23.sol'

