Re: [Gems-users] GEMS Simulator Simulation time

[Hrishikesh Das <hrishikesh.das@xxxxxxxxx>]

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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