Hi Zhengrong, On Thu, Jan 12, 2023 at 2:40 PM Zhengrong Wang via gem5-users < gem5-users@gem5.org> wrote:
> Hi All, > > Our group has been using gem5 for architecture research for a long time, > and we currently want to explore some ideas on modern multi-chiplet > architectures, e.g. AMD's EPYC. We want to understand the tradeoffs of NoC > design and coherence protocol when there are multiple chiplets connected > together, each chiplet with its own NoC and caches and the LLC can be > private or shared between chiplets. > > To start with, we want to understand the current support in gem5 for such > systems. Specifically: > > 1. Are there existing scripts/configurations modelling an AMD EPYC like > systems? We couldn't find them in gem5 or gem5 resources. Any pointers > would be appreciated. > I made a WIP a couple of months ago here: https://gem5-review.googlesource.com/c/public/gem5/+/65612. Note that this *doesn't work*. I tried to set things up so that the LLC was a victim cache, but those options seem to have broken the coherence. I haven't had time to debug. This is still using the SimpleNetwork, but adding Garnet should be possible... once it's working ;). Feel free to pick this up and build on top of it! > > 2. If not and we have to model the system by ourselves, what is a good > starting point? The most reasonable one to us is the CHI protocol, which > seems to be flexible enough to model the coherence protocol. > Yeah, this is exactly what I was thinking as well! > > Thanks in advance for any help you can provide. > > Bests, > Zhengrong > > *王 钲 荣* > > Zhengrong Wang > Computer Science Department > University of California, Los Angeles > California, USA > 90024 > > Work Email: seanyukig...@gmail.com > Mobile :+1 310-447-4568 > > > _______________________________________________ > gem5-users mailing list -- gem5-users@gem5.org > To unsubscribe send an email to gem5-users-le...@gem5.org >
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