Re: [Gems-users] GEMS Simulator Simulation time

["Min Xu (Hsu)" <xu@xxxxxxxxxxx>]

Don't forget to find a faster CPU with bigger cache! ;-)

On Wed, 02 Nov 2005 Mike Marty wrote :
> As Dan said, slowdown is significant with timing models.  When Ruby is
> used for timing on top of Simics, we see a slowdown of 10x or so.
> 
> Things to watch out for:
> 
>  -- Make sure your host machine is not paging.  Simics should be cranking
> away at 100% of the CPU time
> 
>  -- Make sure that Opal and Ruby are compiled with optimizations.  O2 or
> better.
> 
>  -- Try setting the memory latency of Ruby to a very low value to see if
> this speeds things up.  Of course you may not want to simulate a fast
> memory latency
> 
> 
> 
> Mike
> 
> 
> 
> > 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.
> >
> _______________________________________________
> Gems-users mailing list
> Gems-users@xxxxxxxxxxx
> https://lists.cs.wisc.edu/mailman/listinfo/gems-users