Re: [Gems-users] Simics + Ruby slowdown

["Daniele Bordes" <daniele.bordes@xxxxxxxxx>]

Hi Dave. Thank you very much for the question in your reply . Well,
actually Ruby and Simulated Machine (that is, Simics parameter) had
two different memory size. Now I am running a new simulation with the
same memory sizes of  Ruby and Simulated Machine by Simics, but
simulation is still slow.
What do you suggest? Should I do simulations with little Ruby memory
size or big Ruby memory size?

I also noticed that I compiled Ruby with no optimizations and with
debug options. Could this fact make simulations so slow?

Sorry to be a nuisance.
Thank you again very much.





2006/9/26, Dan Gibson <degibson@xxxxxxxx>:
> The exact slowdown depends on a variety of factors (workload, host
> machine, host memory size, target memory size, target number of hardware
> thread contexts, etc), and not all of the slowdown numbers are from the
> same sources.
>
> Suffice to say the simulation will be VERY slow, *about* 45kx slower
> than realtime. Try running your workload on a real machine and see how
> long it runs.
>
> Regards,
> Dan
>
> Daniele Bordes wrote:
> > Thank you very much Mike, but I have not understood what you said:  it
> > took me 3 minutes to simulate with Simics, not to run the benchmark
> > over a real target machine. I have read the tutorial: shouldn't the
> > slowdown be of a factor of 15 between Simics and Simics+Ruby
> > simulation? In other words, shouldn't the simulation with Simics+Ruby
> > finish in 3 minutes x 15 = 45 minutes (or at least, few hours) ?
> >
> > Sorry to be a nuisance.
> > Thank you very much,
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