[Cbc] Infeasible only with Multithreading

[Mario Souto]

Dear John,

I really appreciated the explanation of the multi-threading. I tried with a
smaller number of threads and it works like a charm.

Thanks very much John.

Mario Souto.

2014-12-29 15:33 GMT-02:00 John Forrest <john.forrest at fastercoin.com>:

>  Mario,
>
> Multi-threading comes in two flavours - opportunistic and deterministic.
>
> Opportunistic is more efficient, but not exactly repeatable.
>
> The meaning of the parameter threads is -
>
> 0 - off - running in serial mode
> n (1-reasonable) - opportunistic using n threads.  With k cpus, I would
> use k or maybe one more.
> n (101-) - deterministic using n-100 threads.  With k cpus I would use k
> or maybe up to 2*k as load balancing is worse.
>
> threads == 100 ! should be as 0, but somewhere a parallel flag has been
> set and so things go wrong.
>
> Solution - don't use 100 - I will probably get round to treating as 0.
>
> John Forrest
> On 29/12/14 16:36, Mario Souto wrote:
>
> Dear all,
>
>  I am using the version 2.8.12 of Cbc and having some strange problem
> with the Multithreading feature. The following problem is 'proven
> infeasible' when using 100 threads. However, an integer solution cab be
> found when only one thread is used.
>
>  Does any one have some idea about it?
>
>  Thanks in advance,
>
>  Mario Souto.
>
>
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