Re: [Gems-users] Inclusive L2 cache

[Edward Lee <edwl202@xxxxxxxxx>]

I looked at the protocols page before. There is no information on SMP protocols exclusivity there. 

And I know it is a coherence level issue, that's why I am trying understand if there is a connection between single SLICC controller usage and exclusivity. I am not a GEMS expert and just started looking at the base code to be able to make some changes for a new protocol. So, I am sorry if I ask any naive question here.

So, should I check the cache.sm and directory.sm files to get my answers for any protocol? Any guidance on which specific parts of the protocol codes to look especially for the MOESI_SMP_directory protocol?

Regards,

~ Ed

On Wed, May 13, 2009 at 11:58 AM, Carole-Jean Wu <carolewu@xxxxxxxxxxxxx> wrote:

Take a look at Take a look at http://www.cs.wisc.edu/gems/doc/gems-wiki/moin.cgi/Protocols

-Carole

On Wed, May 13, 2009 at 11:38 AM, Greg Byrd <gbyrd@xxxxxxxx> wrote:

Unless things have changed, the combined L1/L2 controller use exclusive
caches, not inclusive.

...Greg

Derek Hower wrote:
> Inclusivity/exclusivity is a coherence-level issue.  Thus, it is
> determined solely by the behavior of the SLICC generated protocol.  To
> the best of my knowledge, all released protocols in GEMS are inclusive.
>
> -Derek
>
> On Wed, May 13, 2009 at 10:22 AM, Edward Lee <edwl202@xxxxxxxxx

> <mailto:edwl202@xxxxxxxxx>> wrote:
>
>     Hi all,
>
>     I am trying to add another cache besides L1/L2 to my target system
>     like a victim cache or an RAC. So, I am wondering how to determine
>     exclusivity of the caches in GEMS? For example,
>     MOESI_SMP_directory protocol has a single SLICC controller for
>     L1/L2, does this mean that the L2 is inclusive? Where in the GEMS
>     code is this determied?
>
>     Thanks for any help.
>
>     Regards,
>
>     Ed
>
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