[Scip] Determinism

[Alejandro Burzyn]

Thank you all for your answers, I think I've made a mistake somewhere with the lp 
(I think I've modified it somewhere between runs). However, I did test on different computers 
with same lp and same binary, and there I saw differences in stats  no related to time, is this behaviour expected? 
Thank you,
Alejandro



--- El vie 16-oct-09, Tobias Achterberg <achterberg at zib.de> escribió:

De: Tobias Achterberg <achterberg at zib.de>
Asunto: Re: [Scip] Determinism
A: "Alejandro Burzyn" <aleburzyn at yahoo.com>
Cc: scip at zib.de
Fecha: viernes, 16 octubre, 2009, 11:36 am

SCIP should be deterministic, provided that in each of the two runs you use
- the same computer and operating system,
- the same parameter settings,
- the same binary,
- the same problem instance (i.e., the exact same input file).

Of course, if you have set a time limit and SCIP hits this time limit, then the result is
also non-deterministic.

If you still have non-determinism, then there is a bug.


Tobias

Alejandro Burzyn wrote:
> Hello everyone, I'm currently using the SCIP solver and I've found
> recently that different runs
> on the same lp give me different times (with great difference, like 1h
> to 2h). At first I thought
> it was my fault because I was using other programs while runnning SCIP.
> But, when I read the
> stats report, there are differences not only in the times values,
> they're everywhere.
> So my question is: is SCIP deterministic? if it is not, is it possible
> to make it deterministic?
> Thank you very much for your attention,
> Alejandro Burzyn
>  
> 
> 
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