How to set number of threads (workers in VRP)

[Michal Stankowski]

Hello!

Is there any way to increase a number of threads in VRP calculations? I can see that it's possible for the CP Solver, therefore it sounds logical to me to be able to do that on VRP. I was trying to find that in Python definitions, and in documentation, but didn't found anything.

Thanks in advance for help!

Best regards,

Michal

[Laurent Perron]

You can't. 

Routing is based on the original cp solver. 

Multi threading is implement on the new CP-SAT solver. 

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[Michal Stankowski]

Thanks Laurent!

This is a very sad information, since my computer nearly burns when I ask for solution ;)

Have a nice day!

Michal

W dniu czwartek, 12 września 2019 16:47:11 UTC+2 użytkownik Laurent Perron napisał:

You can't. 

Routing is based on the original cp solver. 

Multi threading is implement on the new CP-SAT solver. 

Le jeu. 12 sept. 2019 à 16:45, Michal Stankowski <michal.s...@portacapena.com> a écrit :

Hello!

Is there any way to increase a number of threads in VRP calculations? I can see that it's possible for the CP Solver, therefore it sounds logical to me to be able to do that on VRP. I was trying to find that in Python definitions, and in documentation, but didn't found anything.

Thanks in advance for help!

Best regards,

Michal

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[Vincent Furnon]

Note you can "kind of" mimic what is done in cp-sat. Just solve the problem n times in parallel with different first solution heuristics (you need to build the routing model n times but all models can share distance/time/cost matrices which should be immutable). At least parallelism will improve robustness of solutions.

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[Siddharth Jain]

checking to see if there is any update on this