Re: [Gems-users] simulating perfect L2 for CMP

[Thomas Yeh <tomyeh@xxxxxxxxxxx>]

Thx for the suggestion. I need the protocol to be simulated, so I'll have 
to run opal and ruby.
I assume that setting the memory latency to zero 
involves setting PERFECT_MEMORY_SYSTEM to true and 
PERFECT_MEMORY_SYSTEM_LATENCY to 0.
PERFECT_MEMORY_SYSTEM: false
PERFECT_MEMORY_SYSTEM_LATENCY: 0


On Mon, 9 Oct 2006, Dan Gibson wrote:

> I recommend you set the memory latency to zero.
>
> My other comments follow:
>
> Thomas Yeh wrote:
> > I am currently simulating with the MOESI_CMP_directory protocol, and would
> > like to run the simulations with a perfect L2.
> >
> > What is the best way to do this?
> > 1) Running opal without ruby and specifing L2_IDEAL?
> Running without ruby doesn't simulate any cache coherence. Unless this
> is what you're intending, running without Ruby is probably a bad option.
> > 2) Run both opal and ruby, but specify L2 is always a hit locally?
> Yes, you could do that.
> > Is the L1 always 1 cycle when running opal w/o ruby? I don't see
> > a parameter for setting the L1 latency.
> Opal w/o Ruby uses its own cache model, based on a uniprocessor
> hierarchy. See Opal's cache.[Ch].
> > If I run without ruby, how do I compare the performance? Since there won't
> > be a ruby_cycle metric.
> Opal will still produce several metrics. Pick your favourite and use
> that instead.
> > thx,
> > Tom
> Regards,
> Dan
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