Re: [Gems-users] ruby configuration and FFT results

[Dan Gibson <degibson@xxxxxxxx>]

How is your memory system configured? (look in 
$GEMS/ruby/config/rubyconfig.defaults)
In Simics+Ruby configurations, the scalability is determined by:
1) The workload (SPLASH-2 scales OK for small configurations)
2) The ruby setup (e.g., cache sizes, coherence protocol, etc)

The commands you mentioned below aren't performance options: they are 
*necessary* for proper, accurate functionality of ruby. Have a look at 
the Simics reference manual to find out what they do -- to summarize: 
they allow ruby to realistically model caches.

Regards,
Dan

nikiforg@xxxxxxxxxx wrote:
> Hi all,
> In the wiki documentation, it is declared as important to follow some steps as:
>
>   simics> instruction-fetch-mode instruction-fetch-trace
>   simics> istc-disable
>   simics> dstc-disable
>   simics> cpu-switch-time 1
>
> configuring ruby as above, the results of the SPLASH2 FFT running on
> MOSI_SMP_Bcast are not good! There is no scalability! System with 2 CPUs is
> faster than any aother system! If I do not follow the steps above, everything
> seems OK(scalable up to 8 CPUs).
>
> Something else I want to ask is about L1 ang L2 caches and their size! Where can
> I configure them!
>
> Nikiforos.
>
>
>  
>
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