Re: [Gems-users] Directories in MOESI_CMP_NUCA

[Greg Byrd <gbyrd@xxxxxxxx>]

"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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