[Cbc] Using parallel branch & bound

[Jesse Jaanila]

Hi Sam,

Thanks, that did the trick. My other question would then be, how can I
specify the how many threads the CbcModel object can use with branch and
bound? Or does the models query my processor architecture at compile time
and use a suitable amount of threads implicitly?

I ask because there doesn't seem to be any setter methods for the number of
threads. (Only getters: parallelMode() and numberThreads_).

Jesse

On Sun, Feb 26, 2017 at 1:31 PM, Sam Mathew <sam.cfd.iitm at gmail.com> wrote:

> Hi Jesse,
>
> In order to use parallel, you need to do this while configuring during
> installation of Cbc.
>
> The right step then would be (supposing you are in the build directory,
> within the directory where CBC has been downloaded using SVN)
>
> ../configure --enable-cbc-parallel
> make
> make install
>
> It might help if you look at the fourth option on the following:
> https://projects.coin-or.org/Cbc/wiki/FYI
>
> Then you can use the parallel version within C++.
>
> JuMP has it pre-configured to run parallel, so you did not need to do it
> there.
>
> Regards,
>
> Sam
>
> On 25 February 2017 at 22:56, Jesse Jaanila <jessejaanila at gmail.com>
> wrote:
>
>> Hi,
>>
>> In the past, I have used CBC though Julia JuMP library, where running
>> parallel branch & bound can be done easily by specifying the Threads=N
>> argument for the solver. I'm now transferring some of my code to C++ and
>> I'm not sure how to run the B&B parallel using C++. Is it trivial?
>>
>> What's worrisome is that model.haveMultiThreadSupport() returns false
>> which suggest I don't even have the prerequisites for parallel B&B. I guess
>> the quick start guide for Unix-like systems in
>> https://projects.coin-or.org/Cbc doesn't include the necessary option
>> for building CBC with parallel support. What actions should I take? I'm
>> fine with rebuilding the whole set of libraries and dependencies.
>>
>> Thanks!
>> Jesse
>>
>> _______________________________________________
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>> Cbc at list.coin-or.org
>> http://list.coin-or.org/mailman/listinfo/cbc
>>
>>
>
>
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