Re: [Gems-users] Garnet with crossbar topology

[Paul Mejia <pmmejia@xxxxxxxxxxx>]

Thanks for the replies.

I have a question on the fixed pipeline model. Why is there a separate
stage for link traversal? If I specify link_latency:1, would the LT
pipeline stage be redundant?

Thanks,
Paul


On Thu, Feb 25, 2010 at 9:18 AM, Dan Gibson <degibson@xxxxxxxx> wrote:
> 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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