Multithreading to solve MIP with open source solvers

[pranav]

Hi,

Is there a way to specify the number of threads for solving a MIP while using open source solvers?

I tried using GLPK and CBC. I run the MIP on a Windows serrver.

I installed cbc 2.9.5:
For CBC:
I tried giving the option:
results = opt.solve(instance, suffixes = ['rc'], options = "threads=24", tee=True)

I get a message:
No match for threads
No match for 24

Please let me know if it is possible to specify multiple threads while using CBC on Windows server or is it only possible for Linux servers. Thank you.

Regards,
Pranav

[Gabriel Hackebeil]

Solver options should be set on the solver object’s “options” dictionary. Try this:

opt.options[‘threads’] = 1

results = opt.solve(instance, suffixes[‘rc’], tee=True)

Gabe

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[Gabriel Hackebeil]

Also, it could be that those solvers do not support multithreading. Have you checked their documentation?

Gabe

[pranav]

Hi,

Thank you Gabe. It seems that parallelization can be done on CBC only on the Linux version. Can you suggest me some open source solvers that allow multi threading on windows server for solving MIP?

Thank you.
Regards,
Pranav