
Gurobi 11.0.1 (mac64[x86], gurobi_cl) logging started Tue Nov 19 02:23:56 2024

Set parameter Username
Set parameter TimeLimit to value 50
Set parameter LogFile to value "./lp_solutions/grafo180.27.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/grafo180.27.lp
Reading time = 0.29 seconds
: 172361 rows, 1311 columns, 518212 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 172361 rows, 1311 columns and 518212 nonzeros
Model fingerprint: 0xb84d92b1
Variable types: 35 continuous, 1276 integer (1276 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 82657 rows and 13 columns
Presolve time: 1.36s
Presolved: 89704 rows, 1298 columns, 270451 nonzeros
Variable types: 0 continuous, 1298 integer (1263 binary)
Found heuristic solution: objective 5.0000000
Root relaxation presolved: 1298 rows, 91002 columns, 271749 nonzeros


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

    Iter     Pivots    Primal Obj      Dual Obj        Time
       0        401    -infinity     -3.0000000e+00      2s
       1       2401  -3.7660606e+02  -1.2704054e+01      2s
       2       2722  -3.1293939e+02  -1.3039091e+01      2s
       3       3052  -2.5093939e+02  -1.3171755e+01      2s
       4       3304  -2.5093939e+02  -1.3287715e+01      2s
       5       3586  -2.5093939e+02  -1.3331861e+01      2s
       6       3851  -2.5093939e+02  -1.3353927e+01      2s
       7       4110  -2.5093939e+02  -1.3410078e+01      2s
       8       4356  -2.5093939e+02  -1.3427369e+01      2s

Sifting complete


Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
   33621    3.8944698e+01   0.000000e+00   2.911822e+03      5s
   51025    3.9000000e+01   0.000000e+00   0.000000e+00      7s
   51025    3.9000000e+01   0.000000e+00   0.000000e+00      7s

Root relaxation: objective 3.900000e+01, 51025 iterations, 5.46 seconds (3.79 work units)
Total elapsed time = 12.86s (DegenMoves)
Total elapsed time = 16.97s (DegenMoves)

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

     0     0   39.00000    0  444    5.00000   39.00000   680%     -   17s
H    0     0                       6.0000000   39.00000   550%     -   17s
     0     0   39.00000    0  600    6.00000   39.00000   550%     -   27s
     0     0   39.00000    0  619    6.00000   39.00000   550%     -   29s
     0     0   39.00000    0  427    6.00000   39.00000   550%     -   50s

Cutting planes:
  Gomory: 4
  Lift-and-project: 36
  Cover: 3
  Clique: 33
  MIR: 123
  Zero half: 35
  RLT: 66
  BQP: 4

Explored 1 nodes (75605 simplex iterations) in 50.03 seconds (58.43 work units)
Thread count was 8 (of 8 available processors)

Solution count 2: 6 5 

Time limit reached
Best objective 6.000000000000e+00, best bound 3.900000000000e+01, gap 550.0000%

Wrote result file './lp_solutions/grafo180.27.sol'

