Re: [Gems-users] GEMS Simulator Simulation time

[Mike Marty <mikem@xxxxxxxxxxx>]

Your slowdown is way too high and seems abnormal.  How much memory is in
your machine?

--Mike


> Dan,
>
> Thanks for the prompt reply,
>
> Is there a way I can speed it up? Right now I am not loading/simulating the
> Opal module. Will loading this result in more slowdown(as I expect) ?
>
> Also as an alternative whats the simplest benchmark that I can test ? I mean
> a very simple benchmark that executes very fast.
>
> Thanks,
> Hrishikesh.
>
>
> On 11/2/05, Dan Gibson <degibson@xxxxxxxx> wrote:
> >
> > Hrishikesh,
> >
> > The performance impact of using a memory timing model (like Ruby) is
> > very significant. The slowdowns you are reporting are not unusual--in
> > some cases running Simics with Ruby can slow simulation very
> > significantly.
> >
> > The reason for the slowdown is quite complex, and it not accounted for
> > entirely by execution within the timing model. Specifically, Simics
> > itself runs (much) slower when memory timing models are used.
> >
> > Regards,
> > Dan Gibson
> >
> > Hrishikesh Das wrote:
> >
> > > Dear Sirs,
> > >
> > > I am a student using GEMS in a Parallel computing architecture course.
> > > I am using SIMICS and a SIMICS suse 7.3 image running on a X86 dual
> > > processor server.
> > >
> > > The problem I am facing is that when using Ruby for simulation, the
> > > simulation is extremely slow. Ex- a simple simulation of Unixbech,
> > > that takes SIMICS about 1 -2 minutes to emulate, takes SIMICS with
> > > Ruby about 10+ hours. Is this kind of slowdown natural ? Is there
> > > anything I can do to speed things up ? I need to get these results
> > > done for my course work,
> > >
> > > Any help will be greatly appreciated.
> > > Thanks,
> > > Hrishikesh Das.
> > >
> > > Graduate Student,
> > > Mississippi State University.
> > >
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