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Water network benchmark: slow convergence on water.nl, failures on MINLP relaxations

Status: Open.

#13 In jkitchin/ripopt;

· jkitchin opened on Apr 12, 2026

Poor performance and NumericalError on gas pipeline network NLPs (PDE-discretized, banded structure)

Status: Open.

#12 In jkitchin/ripopt;

· jkitchin opened on Apr 6, 2026

27 CUTEst problems with significant performance regression vs Ipopt

enhancementNew feature or requestNew feature or request

Status: Open.

#10 In jkitchin/ripopt;

· jkitchin opened on Apr 5, 2026

HS problems TP072 and TP119: both solvers fail

enhancementNew feature or requestNew feature or request

Status: Open.

#9 In jkitchin/ripopt;

· jkitchin opened on Apr 5, 2026

23 CUTEst problems where Ipopt succeeds but ripopt fails

enhancementNew feature or requestNew feature or request

Status: Open.

#8 In jkitchin/ripopt;

· jkitchin opened on Apr 5, 2026

Notify model when variables have changed to enable efficient caching

Status: Open.

#5 In jkitchin/ripopt;

· prehner opened on Mar 31, 2026