Re: [Gems-users] counting number of hits and misses

[Rishi Jain <rjain@xxxxxxxxxxxx>]

Thanks for the response, Min

We were thinking of adding the extra code at the Simics-Ruby interface...
where Ruby receives all the requests from the Simics Processor. Which
module/class implements this?

And is there a function which keeps track of the number of
(aggregate) misses?


thanks
rishi



On Sun, 12 Mar 2006, Min Xu (Hsu) wrote:

> Rishi,
>
> I don't think getRubyMemoryValue/setRubyMemoryValue are called
> unless in TM protocols. Perhaps an alternative way that works
> in all protocols is to find where the cache misses are counted
> (aggregated, not per-processor) and then change the code to
> take an extra processor ID.
>
> -Min
>
> On Sun, 12 Mar 2006 Rishi Jain wrote :
> > Hi,
> > We are trying to modify the GEMS simulator for CMP protocol. We want to
> > keep track of hits and misses to the L2 cache on a per-processor basis.
> > We are thinking of adding required methods in ruby/system/CacheMemory.h,
> > which would be called by ruby/system/Sequencer.C in getRubyMemoryValue and
> > setRubyMemoryValue methods. We also plan to modify the Sequencer class to
> > include a member for the processor_id.
> >
> >
> > /* -------------------------------------------------------------- */
> > bool Sequencer::getRubyMemoryValue(const Address& addr, char* value, unsigned int size_in_bytes ) {
> > 	...
> > 	...
> > 	if (Protocol::m_CMP && n->L2_CACHE_MEMBER_VARIABLE->tryCacheAccess(lineAddr, CacheRequestType_LD, dataPtr)){
> > 		<do something>
> > 		n->L2_CACHE_MEMBER_VARIABLE->incrementNumHits(m_processor_id); // m_processor_id is a member of Sequencer object
> > 	}
> > 	...
> > } // end getRubyMemoryValue
> > /* -------------------------------------------------------------- */
> >
> > There would be a similar code for tracking number of misses. Also, these
> > two functions will be called from setRubyMemoryValue as well.
> >
> >
> > I was wondering if we could get some opinion about this approach. Are we
> > on the right track? And do we need something else besides this, to
> > implement the functionality?
> >
> >
> > thanks
> > rishi
> >
> >
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