Bonmin options

[Carlos Vergara]

Hi everyone,

how can i change or modify the bonmin solver options?

Thanks,

Carlos

[Bethany Nicholson]

See the Pyomo online documentation: https://software.sandia.gov/downloads/pub/pyomo/PyomoOnlineDocs.html#_passing_options_to_a_solver

Bethany

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[Carlos Vergara]

I tried  --solver-options= "mipgap=0.01 "  but i get this error:

[    0.00] Setting up Pyomo environment

[    0.00] Applying Pyomo preprocessing actions

[    0.00] Creating model

[    0.07] Applying solver

ERROR: "[base]\site-packages\pyomo\opt\base\solvers.py", 568, solve

        Solver (asl) returned non-zero return code (1)

ERROR: "[base]\site-packages\pyomo\opt\base\solvers.py", 571, solve

        See the solver log above for diagnostic information.

[    2.70] Pyomo Finished

ERROR: Unexpected exception while running model:

        Solver (asl) did not exit normally

[Gabe Hackebeil]

Try adding --stream-solver to see if Bonmin gives you more information.

Gabe

[David Woodruff]

I looked at the Bonmin documentation and did not see a mipgap option. Pyomo passes the options specified by --solver-options to the directly to the solver, so you need to use an option name that Bonmin uses. See
https://software.sandia.gov/downloads/pub/pyomo/PyomoOnlineDocs.html#_passing_options_to_a_solver

Here is the Bonmin documentation that I looked at:
https://projects.coin-or.org/Bonmin/browser/stable/1.5/Bonmin/doc/BONMIN_UsersManual.pdf?format=raw

[Carlos Vergara]

Bonmin documentation has all the commands to change the options.

Its just needed to add 'bonmin' before the option (bonmin.algorithm=xxxxxx)

Thank you