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Pyomo has two solver managers to execute external solvers:

  • neos (remote execution)
  • serial (local execution).
pyomo help --solvers

yields a list of solvers available for each manager. It states

The following solver interfaces are available with YOUR CURRENT SYSTEM configuration: ...

That list does NOT contain Gurobi for the neos manager, which I want to use for my task.

Does it depend on my

current system configuration

or is it a feature not implemented ? What configuration would be necessary ?

current system:

Pyomo 6.4.2 (CPython 3.9.13 on Windows 10)
Python 3.9.13
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    $\begingroup$ As far as I know, the only way to use Gurobi on the Neos is by using its web-based interface. Also, using Gurobi on the other AML needs to have a valid license. $\endgroup$
    – A.Omidi
    Nov 24, 2022 at 7:45
  • $\begingroup$ Yes, with a valid license it is working locally. Probably a restriction from NEOS. $\endgroup$
    – Lars Hadidi
    Dec 2, 2022 at 12:59

1 Answer 1

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It is due to the interface on the NEOS server:

ampl: option solver kestrel;
ampl: option kestrel_options 'solver=gurobi';
ampl: option neos_server 'neos-server.org:3333';
ampl: option email 'USER@MAIL';
ampl: solve;
Connecting to: neos-server.org:3333
gurobi is not available on NEOS. Choose from:
    Bonmin
    Cbc
    CONOPT
    COUENNE
    CPLEX
    FilMINT
    filter 
    Ipopt
    KNITRO
    L-BFGS-B
    LANCELOT
    LGO
    LOQO
    MINLP
    MINOS
    MINTO
    MOSEK
    OCTERACT
    OOQP
    PATH
    RAPOSa
    SNOPT

To choose: option kestrel_options "solver=xxx";


exit value 1
<BREAK>
ampl:
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