Re: [Gems-users] Garnet Network parameters

[Niket Agarwal <niketa@xxxxxxxxxxxxx>]

You can model lower bandwidth links as you said. Please follow 
https://lists.cs.wisc.edu/archive/gems-users/2009-April/msg00076.shtml
-Niket

Edward Lee wrote:
> Hi all,
>
> I would like to verify the meaning of some simulation parameters to
> come up with realistic network parameters.
> I am running a 2GHz serengeti machine with 16 processors using
> MOESI_SMP_directory protocol to simulate a 16-core CMP with private
> caches.
>
> Here are some configuration values:
>
> SIMICS_RUBY_MULTIPLIER: 4 --> does this mean Ruby clock is 2GHz/4 = 0.5GHz?
>
> network is 4x4 MESH via GARNET
> g_FLIT_SIZE: 16
>
> a snapshot of network parameters:
>
> ....
>
> ext_node:L1Cache:0 int_node:0 link_latency:1
> ext_node:Directory:0 int_node:0 link_latency:4
> int_node:0 int_node:1 link_latency:8 link_weight:1
>
> ...
>
> So, since FLIT_SIZE refers to bytes/cycle and it is suggested to tune
> the latencies for lower bandwidths. Would it be accurate to make the
> following assumtions?
>
> 16 bytes/cycle * 0.5 Ghz / link_latency = link_bandwidth
>
> Accordingly,
>
> bandwidth to caches 8GB/s, bandwidth to memory/directory 2 GB/s,
> bandwidth between cores is 1GB/s
>
> Thanks for any input in advance,
>
> Ed
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