Decision Optimization

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 Initializing dual steep norms . . .

Serge Bisaillon's profile image
Serge Bisaillon posted Wed January 14, 2026 02:52 PM

Hi!

I have been using CPLEX for almost 30 years and this is the first time I get this behavior.

When I solve my MIP, I get this message:

Initializing dual steep norms . . .

and it stays stuck there for hours without doing anything else.

I have tried to modify the Markowitz tolerance , change the dual pricing, even modify my MIP in a way that I first solve with a big chunk of my constraints and add the capacity constraints afterwards, and nothing works.

Can you help me?

Thanks

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Serge Bisaillon

PhR's profile image
PhR posted Thu January 22, 2026 03:54 AM

Hi Serge,
Can you post the log here or at least give the size of your model ?
Usually, this issue can be solved by changing the dual pricing parameter value (DPriInd : https://www.ibm.com/docs/en/icos/22.1.2?topic=parameters-dual-simplex-pricing-algorithm)

Setting it to 4 (Steepest-edge pricing, unit initial norms) should remove this step but you can also try using devex (value 5).
Have you tried those ?
Thanks.

Philippe

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