[Scip] problems with solving LPs

[Frank Hennig]

Hi,

 

I run a Branch-and-Price algorithm that solves very many LPs in its
nodes.

 

Unfortunatelly I very often encounter the error message:

 

src/scip/solve.c:670] ERROR: Error <-6> in function call
[src/scip/solve.c:1812] ERROR: Error <-6> in function call
[src/scip/solve.c:2443] ERROR: Error <-6> in function call
[src/scip/solve.c:3018] ERROR: Error <-6> in function call
[src/scip/scip.c:5221] ERROR: Error <-6> in function call

 

 

which leads to abortion of the SCIPsolve routine.

 

One possible reason is: [src/scip/lp.c:10772] debug: unresolved error
while resolving LP in order to exceed the objlimit

 

 

The errors like to occur in the SCIP heuristics (preferably diving) but
also during solving a node.

 

 

Is their any chance to improve the performance?

 

 

This costs time and also may lead to random solvability.

 

 

Thank you very much.

 

Regards,

 

Frank

 

 

 

________________________________________________________

 

Frank Hennig  -  Naval Architect, PhD Candidate

 

Department of Industrial Economics and Technology Management

Norwegian University of Science and Technology

Alfred Getz veg 3

NO-7491 Trondheim, Norway

 

Phone:   +49 30 314 23 598

Email:      frank.hennig at iot.ntnu.no

 

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