Hi, I am solving a somewhat large LP with method set to Barrier and crossover disabled but, based on guessing from the log below, Gurobi is still stuck in crossover. Any clues as to what i should do to prevent crossover; that is, I would prefer to use the solution before crossover.
Here is the log:
Warning for adding constraints: zero or small (< 1e-13) coefficients, ignored
Optimize a model with 13543306 rows, 13523098 columns and 61307888 nonzeros
Variable types: 13520697 continuous, 0 integer (0 binary)
Semi-Variable types: 2401 continuous, 0 integer
Matrix range [1e+00, 1e+00]
Objective range [1e-05, 3e+00]
Bounds range [0e+00, 0e+00]
RHS range [3e-05, 1e+00]
Presolve removed 0 rows and 0 columns (presolve time = 25s) ...
Presolve removed 117035 rows and 610 columns (presolve time = 41s) ...
Presolve removed 117035 rows and 95149 columns (presolve time = 482s) ...
Presolve removed 117035 rows and 95149 columns
Presolve time: 482.34s
Presolved: 13426271 rows, 13427949 columns, 61096314 nonzeros
Variable types: 13427949 continuous, 0 integer (0 binary)
Root barrier log...
Ordering time: 0.00s
Dense cols : 1791
AA' NZ : 4.767e+07
Factor NZ : 9.697e+07 (roughly 12.0 GBytes of memory)
Factor Ops : 5.464e+10 (roughly 3 seconds per iteration)
Threads : 16
Iter Primal Dual Primal Dual Compl Time
0 1.28000036e+01 0.00000000e+00 1.18e+03 0.00e+00 1.96e-01 813s
336 1.09865855e+00 1.09865803e+00 5.83e-08 1.82e-07 2.25e-14 6653s
Barrier solved model in 336 iterations and 6653.31 seconds
Optimal objective 1.09865879e+00
Root crossover log...
12150781 variables added to crossover basis 6775s
17634481 variables added to crossover basis 6780s
20712081 variables added to crossover basis 6785s
20716100 variables added to crossover basis 6790s
3067352 DPushes remaining with DInf 2.2508732e+01 6825s
979199 DPushes remaining with DInf 1.8015835e+01 262142s
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