Re: [Gems-users] CMP configuration on gems

[Mike Marty <mikem@xxxxxxxxxxx>]

If you want a Multiple-CMP with a shared cache distributed with the 
cores, then use the MOESI_CMP_directory protocol.  You will want to 
specify a network topology so the banks are distributed with the cores.  
See $GEMS/ruby/network/simple/Network_Files/TILED_* for an example of this.
You can partition the address space by changing the mapping function 
from L1 requests to L2 cache banks. 

--Mike


Niket Agarwal wrote:
> Hey Mike.
> Thanks for the info.
>
> Please address a few issues:
>
> 1. In the Multi-CMP design, if I use a SMP design with 1 processor/chip, 
> and instantiate many chips, it would be a proxy for a many core CMP.
> But, , the L2 cache will become private then. What I really want is that 
> the L2 cache be shared and distributed with the cores. 
>
> 2. The distributed L2 issue is addressed in the NUCA design with using 
> multiple banks and partitioning the address space. But, will this work 
> for 32+ processors ?
> Thanks for the help,
> Niket.
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