Re: [Gems-users] Is GEMS deterministic or NOT?

[Dan Gibson <degibson@xxxxxxxx>]

Ruby is deterministic, provided it has *exactly* the same environment on 
the repeat run. That includes random seed (i.e., RANDOM_SEED), as well 
as less obvious things, like ENV string length, directory structure, 
Simics version, etc. Because Ruby is only controlling a small portion of 
what happens (Simics is in the driver's seat, if you will), Ruby cannot 
guarantee an identical execution if Simics' behavior is somehow 
different. We do not know if Simics itself uses internal randomness, and 
if so, how to seed that randomness. This is one of the many reasons why 
we often present multiple runs of each data point to attain 95% 
confidence intervals.
Regards,
Dan

Guoqiang Yang wrote:
> Hi there,
>
> I guess I have a question about whether GEMS is deterministic or NOT. To 
> be precise, if I run exactly the same simulation multiple times, will I 
> get the same result all the time?
> Many thanks,
>
> Guoqiang Yang
> _______________________________________________
> Gems-users mailing list
> Gems-users@xxxxxxxxxxx
> https://lists.cs.wisc.edu/mailman/listinfo/gems-users
> Use Google to search the GEMS Users mailing list by adding "site:https://lists.cs.wisc.edu/archive/gems-users/"; to your search.
>
>
>   
--
http://www.cs.wisc.edu/~gibson [esc]:wq!