search

coin-or / Clp

COIN-OR Linear Programming Solver
Other
392 stars 82 forks source link

QP: presolve does not works for barrier method #247

Open sergey-mogilnikov-kpbs opened 1 year ago

sergey-mogilnikov-kpbs commented 1 year ago

This is start part of log for primal method:

Coin LP version 1.17.7, build Oct 27 2022
command line - ./clp step2u.mps primalS
At line 2 NAME
At line 3 ROWS
At line 78619 COLUMNS
At line 1416215 RHS
At line 1480634 BOUNDS
At line 1730037 QUADOBJ
Problem no_name has 78614 rows, 170226 columns and 1167369 elements
At line 7050221 ENDATA
Model was imported from ./step2u.mps in 4.178988 seconds
Presolve 19549 (-59065) rows, 134090 (-36136) columns and 939512 (-227857) elements

The are massages about presolving "Presolve 19549 (-59065) rows, 134090 (-36136) columns and 939512 (-227857) elements".

And this is a start part log of barrier method:

Coin LP version 1.17.7, build Oct 27 2022
command line - ./clp step2u.mps barr
At line 2 NAME
At line 3 ROWS
At line 78619 COLUMNS
At line 1416215 RHS
At line 1480634 BOUNDS
At line 1730037 QUADOBJ
Problem no_name has 78614 rows, 170226 columns and 1167369 elements
At line 7050221 ENDATA
Model was imported from ./step2u.mps in 4.103923 seconds
1.0738e+09 elements in sparse Cholesky, flop count 5.27109e+13

So, there are no any massage about presolving if barrier method used. And I can't found way to presolve the problem before barrier.