Re: [Gems-users] Directories in MOESI_CMP_NUCA

["Mishali Naik" <mishalinaik@xxxxxxxxx>]

Thanks for the quick reply. So the file Directory_Controller.C also
refers to the memory controller? Or is it an actual directory?

On 10/25/06, Greg Byrd <gbyrd@xxxxxxxx> wrote:
> "directory" == "memory controller"
>
> The Ruby protocols use the term directory to mean the memory controller,
> whether or not there is an actual directory there.   That might clear up
> some of your questions.
>
> ...Greg
>
>
> Mishali Naik wrote:
> > Hi All,
> >              I have a few questions regarding the MOESI_CMP_NUCA
> > protocol, I have looked at the generated code in L1Cache_Controller,
> > L2Cache_Controller and but I am still not clear:
> >
> > 1) In ruby/network/simple/Network_Files - the topology files have # of
> > directories equal to the # of processors. But the latency to each of
> > the directories is the same, so how are these 8 directories (in case
> > of 8 processors) used?
> >
> > 2) Does directory maintain coherence for L1? or L2? both? or none?
> >
> > 3) In case of DNUCA: What happens on a L2 miss? Is the request first
> > sent to the directory?
> >
> > 4) In case of SNUCA: how is directory used since the blocks are
> > statically placed?
> >          I appreciate all your help.
> >
> > thanks,
> > Mishali
> > CS Undergraduate, UCLA
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