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[BUG] There is no setting to disable bounding free variables in barrier presolve #1711

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[BUG] There is no setting to disable bounding free variables in barrier presolve#1711
#1713
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@chris-maes
chris-maes
opened on Aug 13, 2026

We should have a setting BARRIER_PRESOLVE_BOUND_FREE_VARIABLES where -1 is automatic, 0 is off, and 1 is on. We have seen that turning this off can improve performance.

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  1. chris-maes
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    yuwenchen95
    on Aug 13, 2026
  2. chris-maes
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    bugSomething isn't working
    on Aug 13, 2026
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  5. chris-maes commented on Aug 13, 2026

    @chris-maes
    chris-maes
    on Aug 13, 2026
    ContributorAuthor

    Setting just needs to disable this line of code:

    cuopt/cpp/src/dual_simplex/presolve.cpp

    Line 1002 in 6f164ae

    if (settings.barrier_presolve && free_variables > 0) {

  6. rapids-bot
    closed this as completedin #1713on Aug 14, 2026
  7. ramakrishnap-nv
    added a commit that references this issue on Aug 14, 2026

    Add a hyperparameter that controls bounding of free variables (NVIDIA…

    25ea5a4
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