
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 02:09:21 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo1577.26.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/grafo1577.26.lp
Reading time = 0.48 seconds
: 291278 rows, 1144 columns, 874731 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 291278 rows, 1144 columns and 874731 nonzeros
Model fingerprint: 0x3290641f
Variable types: 30 continuous, 1114 integer (1114 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 147007 rows and 2 columns
Presolve time: 2.02s
Presolved: 144271 rows, 1142 columns, 433892 nonzeros
Variable types: 0 continuous, 1142 integer (1112 binary)
Found heuristic solution: objective 8.0000000
Root relaxation presolved: 1140 rows, 145411 columns, 435034 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0        254    -infinity     -1.0000540e+00      3s
       1       1507  -2.6737500e+08  -1.2595426e+01      3s
       2       3165  -2.5003600e+05  -1.2682172e+01      3s
       3       4768  -3.5003274e+01  -1.5417090e+01      3s
       4       5726  -3.5003274e+01  -1.7891086e+01      3s
       5       6705  -3.5003274e+01  -1.9831813e+01      3s
       6       7711  -3.5003274e+01  -2.3626539e+01      3s
       7       8617  -3.5003274e+01  -2.6935698e+01      3s
       8       9549  -3.5003274e+01  -2.7886257e+01      3s

Sifting complete


Root relaxation: objective 3.500000e+01, 15677 iterations, 1.64 seconds (1.34 work units)
Total elapsed time = 15.58s (DegenMoves)

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

     0     0   35.00000    0  579    8.00000   35.00000   337%     -   23s
H    0     0                       9.0000000   35.00000   289%     -   23s
     0     0   35.00000    0  631    9.00000   35.00000   289%     -   38s
     0     0   35.00000    0  605    9.00000   35.00000   289%     -   40s
     0     0   35.00000    0  583    9.00000   35.00000   289%     -   50s

Cutting planes:
  Cover: 6
  Clique: 54
  MIR: 84
  Zero half: 39
  RLT: 88
  BQP: 10

Explored 1 nodes (30660 simplex iterations) in 50.05 seconds (62.82 work units)
Thread count was 8 (of 8 available processors)

Solution count 3: 9 8 1 

Time limit reached
Best objective 9.000000000000e+00, best bound 3.500000000000e+01, gap 288.8889%

Wrote result file './lp_solutions/grafo1577.26.sol'

