[Cbc] Non Deterministic solution

[John Forrest]

Yves,

Difficult to debug this.  I have run it a hundred times and got the same 
answer each time.

John

On 08/02/16 12:11, Yves Touchard wrote:
>
> John,
>
> I did the changes (two lines in ClpSimplex.cpp) and there is still 
> determinism problems.
>
> Yves
>
> *From:*john.forrest at fastercoin.com [mailto:john.forrest at fastercoin.com]
> *Sent:* Friday, February 05, 2016 5:33 PM
> *To:* Yves Touchard <ytouchard at gopro.com>; cbc at list.coin-or.org
> *Subject:* RE: [Cbc] Non Deterministic solution
>
> Yves,
>
> My guess is that it is because there are places where CoinDrand48 is 
> used.
>
> Most likely is in ClpSimplex.cpp - try changing
>
> Coindrand48()
>
> to
>
> randomNumberGenerator_.randomDouble()
>
> if that fixes I will check change in
>
>
> John
>
>     -------- Original Message --------
>     Subject: [Cbc] Non Deterministic solution
>     From: Yves Touchard <ytouchard at gopro.com <mailto:ytouchard at gopro.com>>
>     Date: Thu, February 04, 2016 11:31 am
>     To: "cbc at list.coin-or.org <mailto:cbc at list.coin-or.org>"
>     <cbc at list.coin-or.org <mailto:cbc at list.coin-or.org>>
>
>     Hello,
>
>     I have just a got a determinism problem with a constraint file:
>
>     You will find at
>     _https://www.dropbox.com/s/uzbmgj48kvtd5yj/pb.tar.gz?dl=0_, a tar
>     file containing five files:
>
>     ·pb.lp is the constraint file.
>
>     ·pbTriv.sol is a solution file of the trivial problem (same
>     problem with relaxed constraints) used for mipstart.
>
>     ·pb.prio is the priority file.
>
>     ·pbCmd1.sol is the most frequent solution provided by coin.
>
>     ·pbCmd1Alt.sol is the alternative solution (not easy to catch it…).
>
>     Command line is:
>
>     bin/cbc pb.lp threads 104 ratio 0.05 mipstart pbTriv.sol priority
>     pb.prio divingP on divingV on divesolves 301 multiple 4 branch
>     printingOptions normal solution pb.sol
>
>     Cbc coin is 2.9.7 rev:2232 compiled with gcc 4.9.0
>
>     Could you have a look on it, please?
>
>     Thanks
>
>     Yves
>
>     ------------------------------------------------------------------------
>
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