Re: [Gems-users] Ruby_cycles != opal0.cycle ?!

[Weihang Jiang <weihang.jiang@xxxxxxxxx>]

Thank you so much, Min :)

One last question about this thread. I found two similar parameters:
SIMICS_RUBY_MULTIPLIER: and  OPAL_RUBY_MULTIPLIER.

I assume you were referring to the one of these. So my question is
what the other one is.

Acutually, I am not very sure how to use ruby/opal for multi-processor
simulation.

What I did is following "QuickStart": 
ruby0.setparam g_NUM_PROCESSORS 2
ruby0.init
opal0.init

It is correct?

On Fri, 4 Mar 2005 00:32:55 -0600, Min Xu (Hsu) <xu@xxxxxxxxxxx> wrote:
> Weihang,
> 
> First question first, the multiplier is used to allow us to
> use the in-order simics cpu model to approximate a N-way issue
> super-scalar processor. In other words, every ruby cycle, we
> could allow N-instructions to be executed in simics.
> 
> However, when running with opal, the multiplier should be set
> to 1, because every opal cycle, up to X number of instructions
> are executed. There is no need to allow opal advance N cycles
> for every 1 ruby cycle, unless you want to simulate a slower
> memory somehow.
> 
> As to your second question, when opal is running with ruby,
> its own cache model is not used. So the parameters you listed
> are safe to ignore. The only case where opal's own cache model
> is used is when running single processor simulation without
> ruby. Opal's own cache model doesn't support coherence yet.
> 
> -Min
> 
> On Thu, 03 Mar 2005 Weihang Jiang wrote :
> > One related question:
> > opal0.listparam lists configuration related to Memory System:
> >
> > IL1_ASSOC                                   :                1
> > IL1_SET_BITS                                :                8
> > IL1_BLOCK_BITS                              :                6
> > IL1_MSHR_ENTRIES                            :              256
> > IL1_STREAM_BUFFERS                          :                0
> > IL1_IDEAL                                   :                0
> > IL1_NL_TYPE                                 :                0
> > IL1_NL_LINES                                :                0
> > IL1_MSHR_QUEUE_SIZE                         :               32
> > IL1_MSHR_QUEUE_ISSUE_WIDTH                  :                2
> > DL1_ASSOC                                   :                1
> > DL1_SET_BITS                                :                8
> > DL1_BLOCK_BITS                              :                6
> > DL1_MSHR_ENTRIES                            :              256
> > DL1_STREAM_BUFFERS                          :                0
> > DL1_IDEAL                                   :                0
> > L2_ASSOC                                    :                4
> > L2_SET_BITS                                 :               12
> > L2_BLOCK_BITS                               :                6
> > L2_MSHR_ENTRIES                             :              128
> > L2_STREAM_BUFFERS                           :                0
> > L2_LATENCY                                  :                6
> > L2_IDEAL                                    :                0
> > MEMORY_DRAM_LATENCY                         :               80
> >
> > Most of them can also be found in ruby. Do I need to unify these
> > values between ruby and opal? Or it is only useful when opal is used
> > alone?
> >
> >
> > On Thu, 3 Mar 2005 21:58:28 -0600, Weihang Jiang
> > <weihang.jiang@xxxxxxxxx> wrote:
> > > Min:
> > > Yes, it has been set to 2. What is the exact use of "multiplier"? When
> > > should it be used?
> > >
> > > Thanks
> > >
> > >
> > > On Thu, 3 Mar 2005 21:06:19 -0600, Min Xu (Hsu) <xu@xxxxxxxxxxx> wrote:
> > > > Weihang,
> > > >
> > > > I notice the opal cycle is exactly twice of the ruby cycle.
> > > > I think the difference came from the ruby/opal multiplier.
> > > > Did you set the multiplier to 2?
> > > >
> > > > -Min
> > > >
> > > > On Thu, 03 Mar 2005 Weihang Jiang wrote :
> > > > > Hi,
> > > > >     opal0.cycle tells me that "The current cycle is: 228737428". But
> > > > > ruby0.dump-stats tells
> > > > > me that "Ruby_cycles: 114368714". Why?
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Weihang Jiang
> > > > > _______________________________________________
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> > > >
> > >
> > > --
> > > Weihang Jiang
> > >
> >
> >
> > --
> > Weihang Jiang
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-- 
Weihang Jiang