Re: [Gems-users] Number of instruction executed in GEMS for CMPs

[Dan Gibson <degibson@xxxxxxxx>]

Be sure to search the list for advice on magic breakpoints. I and several others have gushed wisdom on that topic on several occasions.

Regards,
Dan

On Fri, Apr 30, 2010 at 2:46 PM, Muhammad Shoaib <shoaibbinalt@xxxxxxxx> wrote:

Thanks Dan.

Yeah each processor was roughly executing 350 M instructions.

I will look into magic breakpoints.

On 04/30/10, Dan Gibson  <degibson@xxxxxxxx> wrote:

> Check to see how many instructions each processor executes. I wonder if perhaps c X runs, e.g., Proc0 for X instructions?
>
> Also try cc instead of c -- I forget which one means 'instructions' and which one means 'Simics cycles'.
>
>
> In general, we don't use 'c X' directly to control the simulation. Instead, we insert magic breakpoints to stop simulation when the correct amount of work has been done. That helps us to get rid of artifacts from spin locks, etc., as well.
>
>
> Regards,
> Dan
>
>

> On Fri, Apr 30, 2010 at 12:03 AM, Shoaib Altaf <shoaibbinalt@xxxxxxxx <shoaibbinalt@xxxxxxxx>> wrote:
>
> >
> >
> >
> >
> >
> >
> >
> >
> > List,
> >
> >  
> >
> > I was comparing some results between a single
> > processor and a CMP (say 4 processors), and the criteria depends on the number
> > of cycles. I am running for 350 M instructions like this for both
> > cases
> >
> > c 350000000
> >
> >  
> >
> > Now on the output stat file I got these
> > results.....
> >
> >  
> >
> > 1 Processor:
> >
> >  
> >
> > instructions executed =350000000 
> >
> >
> > Ruby cycles= 1435639304
> >
> >  
> >
> >  
> >
> > 4 Processors:
> >
> >  
> >
> > instructions executed =1449213046 (roughly 1500
> > M)
> >
> > Ruby cycles = 1861225208
> >
> >  
> >
> >  
> >
> > So I have these questions :
> >
> >  
> >
> > 1) I was expecting the instructions executed
> > to be the same why they are different?? in the present scenario the
> > comparison will  not matter....so how should I make sure that the CMP will
> > also run for 350 M instructions
> >
> >  
> >
> > 2) I was also expecting that the ruby cycles will
> > also reduce in case of 4 processors, but they have increased since more
> > instructions are executed ..Why??
> >
> >  
> >
> > 3) My protocol is MSI_MOSI_CMP  and workload
> > is OLTP.
> >
> >  
> >
> > Shoaib
> >
> > _______________________________________________
> >
> > Gems-users mailing list
> >

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> >
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> >
> >
> >
> >
> >
>
>
>
> --
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>
>
>
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>
--
Muhammad Shoaib Bin Altaf
ECE Graduate Student
UW Madison,WI

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