Assertion in Reduce-and-split

[christoph-cullmann]

The attached ILP leads to an assertion:

cbc value_45523.lp -cuts=off -gomory=forceLongOn -reduce=on -solve

### ERROR: CglRedSlpit::generateCuts(): rstat[41]: 0

For that one, you need to specify the gomory cut option to trigger it, I have larger ones that get this even without other cuts.

value_45523.lp.gz

Beside this assertions I get on some ILPs, the reduce yields very nice results reagarding problem solving runtime.

[christoph-cullmann]

Larger ilp:

cbc value_375399.lp -reduce=on -solve

### ERROR: CglRedSlpit::generateCuts(): rstat[890]: 0

Same issue with reduce2.

value_375399.lp.gz

[jjhforrest]

Could not reproduce problem with smaller model - but can with this. Seems fine to take out exit and just ignore free row - modified in master.

…

On 28/01/2021 09:42, Christoph Cullmann wrote: Larger ilp: |cbc value_375399.lp -reduce=on -solve| |### ERROR: CglRedSlpit::generateCuts(): rstat[890]: 0| Same issue with reduce2. value_375399.lp.gz <https://github.com/coin-or/Cgl/files/5886213/value_375399.lp.gz> — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#58 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABWJYHDU5DKNYYWJLDUPSJTS4EWOXANCNFSM4WWXJIVA>.

[christoph-cullmann]

Thanks a lot for the quick fix.

At least with my two small tests (as attached above) this works now nicely.

But I have ~200k more ILPs to try ;=)

Will follow up after they did run once.

[christoph-cullmann]

All Unix tests did pass here now, very nice, no new issues with this cut generator activated did show up and it really helps "a lot" for many problems.

The Windows stuff still differs because of issues like #57 but that is unrelated.

Thanks again for the quick fix!