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

[Dan Gibson <degibson@xxxxxxxx>]

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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