Re: [Gems-users] Garnet with crossbar topology

[Dan Gibson <degibson@xxxxxxxx>]

You could try to actually /make/ a crossbar out of links and routers using the topology file. You would have to make your own decisions on radix, latency, etc., and you would have to make one 'crossbar' per configuration.

Regards,
Dan

On Thu, Feb 25, 2010 at 11:15 AM, Niket Agarwal <niketa@xxxxxxxxxxxxx> wrote:

If you are planning to use the flexible pipeline and specify the number of pipeline stages, you would be approximating the contention in the crossbar. This is because the model is output queued and flits from multiple input ports can simultaneously enter an output queue.

-Niket

On 2/24/2010 5:34 PM, Paul Mejia wrote:

I want to model a crossbar network with increased network latency as
the size of the crossbar is increased. Any suggestions on how to do
this? I'm thinking of using a single router and changing the number of
pipeline stages to simulate a multi-cycle switch traversal stage.

Thanks,
Paul


On Wed, Feb 17, 2010 at 5:40 PM, Niket Agarwal<niketa@xxxxxxxxxxxxx>  wrote:
 

Garnet is only meant for networks with routers. If you specify a crossbar, I
think the topology would be all-to-all with multiple routers instantiated.
You can check what will happen in ruby/network/simple/Topology.C

On 2/17/2010 1:43 PM, Paul Mejia wrote:
   

Hi,

The GEMS wiki says that the Garnet topology can be specified using the
FILE_SPECIFIED format. But can a crossbar be also used via
g_NETWORK_TOPOLOGY: CROSSBAR?

Thanks,
Paul
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