Re: [Gems-users] How to set up the network file for MESI_SCMP_tiledL2bank_directory protocol

[Mike Marty <mikem@xxxxxxxxxxx>]

> I am using GEMS to simulate a single-chip CMP system. I tried to use
> the MESI_SCMP_tiledL2bank_directory protocol, but I don't quite
> understand how to set up the network file to support different
> configurations (e.g., with 2 cores, 4 cores, etc.).
>
> GEMS 1.4 release only includes one file:
> TILED_Procs-16_ProcsPerChip-16_L2Banks-16_Memories-16.txt
> I tried to modify it for a simple two-core system:
> ---------------------------------------------------------------------------------------
> processors:2
> procs_per_chip:2
> L2banks:2
> memories:2
>
> ext_node:L1Cache:0 int_node:0 link_latency:1 bw_multiplier:72
> ext_node:L2Cache:0 int_node:0 link_latency:1 bw_multiplier:72
> ext_node:L1Cache:1 int_node:1 link_latency:1 bw_multiplier:72
> ext_node:L2Cache:1 int_node:1 link_latency:1 bw_multiplier:72
> ext_node:Directory:0 int_node:0 link_latency:1 bw_multiplier:80
> ext_node:Directory:1 int_node:1 link_latency:1 bw_multiplier:80
>
> int_node:0 int_node:1 link_latency:2 bw_multiplier:64
> -------------------------------------------------------------------------------------------
>
>   
I'll try this on my end and get back to you

> Could you help clarify how to set up the network file or provide the
> correct configuration? Is it possible to use other network topology
> like PT_TO_PT?  I couldn't find detailed document on this.
>
>   
PT_TO_PT should run, but not as realistic. 
> Also, is there any other protocol available for simulating single-chip
> CMP? It seems the only one available now is
> MESI_SCMP_tiledL2bank_directory.
>
>   
Sure, you can use MSI_MOSI_CMP_directory or MOESI_CMP_directory.  Just 
set the PROCS_PER_CHIP to the same number of processors.  But since 
these protocols support hierarchical coherence, they are more complex 
than needed for a Single-CMP