Re: [Gems-users] Why the link utilization in ruby network is so low ?

[ubaid001@xxxxxxx]

1. each link has a width of 32 bits.
2. yes, the utilization numbers are different for different links.
3. We are using Simics + Ruby. Can you explain why the utilization is low 
in
this case ?
4. the topology is mesh.

Suhail


Mar 15 2010, Dan Gibson wrote:

> 1. How much bandwidth have you configured for your links?
> 2. Do some links show more utilization than others?
> 3. Are you using Opal, or just Simics+Ruby. I would expect very low
> utilizations with the latter combination only.
> 4. What topology are you using?
>
> Regards,
> Dan
>
> On Mon, Mar 15, 2010 at 3:14 PM, <ubaid001@xxxxxxx> wrote:
>
> > Hi,
> >
> > I am running some traffic simulations in "ruby".  I found that the link
> > utilization numbers (in flits/cycle) reported by ruby were less than 5% 
> > for
> > the seven SPEC OMP2001 benchmarks (applu, apsi, art, equake, mgrid, swim,
> > wupwise).
> > I think a link utilization number around 20% to 30% should be reasonable.
> > These benchmarks were simulated on a CMP system configured with 4
> > processors and 4 shared L2 banks. In ruby, the "Garnet fixed 5-stage
> > pipeline"
> > interconnection network model was used.  Besides, the parameter
> > "OPAL_RUBY_MULTIPLIER" was set to be 1.
> >
> > Suhail
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