Opened 5 years ago

Closed 7 weeks ago

#156 closed defect (migrated)

Cbc-infeasible Cplex&GLPK-feasible

Reported by: bartgadeyne Owned by: tkr
Priority: major Component: Cbc
Version: 2.8.8 Keywords: infeasible
Cc:

Description

Hello all,

I’m having issues solving my model with Cbc. Attached you can find the mps. GLPK and Cplex find feasible solutions. Cplex finds the optimal solution within a minute, while GLPK needs several hours to find a decent solution.

Cbc results:

Continuous objective value is 122787 - 0.61 seconds Cgl0003I 7 fixed, 0 tightened bounds, 321 strengthened rows, 0 substitutions Cgl0000I Cut generators found to be infeasible! (or unbounded) Pre-processing says infeasible or unbounded

When setting the parameters presolve and preprocess to off, Cbc (sometimes) finds an optimal solution with objective value 480069. However, the solution provided by Cplex is 300274.

Do you know why cbc fails to solve this problem to optimality?

Attachments (1)

Allocation.mps (22.1 MB) - added by bartgadeyne 5 years ago.
mps file of model

Change History (2)

Changed 5 years ago by bartgadeyne

mps file of model

comment:1 Changed 7 weeks ago by stefan

  • Resolution set to migrated
  • Status changed from new to closed

This ticket has been migrated to GitHub and will be resolved there: https://github.com/coin-or/Cbc/issues/156

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