Re: [Gems-users] Tiled Network (again)

[Mike Marty <mikem@xxxxxxxxxxx>]

the DirectoryController uses a fixed latency whenever sending a data 
response.  This latency models the long off-chip DRAM response. 

However to limit bandwidth, each Directory should be connected to a new 
IntNode and then set the bw_multiplier to something more realistic like 
4 instead of 80.  The file below essentially uses an artificially high 
DRAM bandwidth (80*bw_multiplier/1000 bytes per cycle). 

--Mike

Niket Agarwal wrote:
> Hey Mike,
> I got that the "Directory" means directory/memory controller. I also 
> looked at the NUCA_** files and found that the latency of Int_node_* to 
> Directory_* is generally of the order of 80 or so. This seems logical, 
> since the memory is off chip. But in the TILED network file, these 
> latencies are 1. Is this right ??
> Niket.
> ext_node:Directory:0 int_node:0 link_latency:1 bw_multiplier:80
> ext_node:Directory:4 int_node:0 link_latency:1 bw_multiplier:80
> ext_node:Directory:8 int_node:0 link_latency:1 bw_multiplier:80
> ext_node:Directory:12 int_node:0 link_latency:1 bw_multiplier:80
> ext_node:Directory:1 int_node:3 link_latency:1 bw_multiplier:80
> ext_node:Directory:5 int_node:3 link_latency:1 bw_multiplier:80
> ext_node:Directory:9 int_node:3 link_latency:1 bw_multiplier:80
> ext_node:Directory:13 int_node:3 link_latency:1 bw_multiplier:80
> ext_node:Directory:2 int_node:10 link_latency:1 bw_multiplier:80
> ext_node:Directory:6 int_node:10 link_latency:1 bw_multiplier:80
> ext_node:Directory:10 int_node:10 link_latency:1 bw_multiplier:80
> ext_node:Directory:14 int_node:10 link_latency:1 bw_multiplier:80
> ext_node:Directory:3 int_node:15 link_latency:1 bw_multiplier:80
> ext_node:Directory:7 int_node:15 link_latency:1 bw_multiplier:80
> ext_node:Directory:11 int_node:15 link_latency:1 bw_multiplier:80
> ext_node:Directory:15 int_node:15 link_latency:1 bw_multiplier:80
>
>  
>
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