Hi Brad!
build/ALPHA_SE_MOESI_CMP_directory/m5.opt configs/example/ruby_mem_test.py
-n 4 --topology=Mesh
Results in:
File "/home/joseph/m5/src/mem/ruby/network/topologies/Mesh.py", line 69, in
ma keTopology
assert(node.type == 'DMA_Controller')
AssertionError
Also, Why are the DMA controllers needed in FS mode?
I understand that the switches all connect to the central switch, but WHY is
that necessary? Why don't all the nodes connect directly to that switch
with external links? Without the N switches, is it not functionally correct
for some reason?
Thanks for the response!
-Joseph
On Wed, Feb 23, 2011 at 8:45 PM, Beckmann, Brad <[email protected]>wrote:
> Hi Joseph,
>
>
>
> The DMA controllers are only needed in full-system mode. The mesh topology
> should work without any DMA controllers under SE mode as well.
>
>
>
> The N+1 switches are needed because each node N attaches to a particular
> switch and then the N+1 switch is central switch.
>
>
>
> Garnet essentially works with many of our topologies, but since there is no
> documentation on how to use it, is not yet ready for large scale usage. We
> should have some documentation available in a next few months.
>
>
>
> And yes, Ruby does not support but interconnect models.
>
>
>
> Brad
>
>
>
>
>
> *From:* [email protected] [mailto:[email protected]] *On
> Behalf Of *Joseph Pusdesris
> *Sent:* Wednesday, February 23, 2011 5:09 PM
> *To:* m5-users
> *Subject:* Re: [m5-users] Ruby questions
>
>
>
> Bump again...
>
> -Joseph
>
> On Wed, Feb 16, 2011 at 6:54 PM, Joseph Pusdesris <[email protected]> wrote:
>
> Bump.
>
>
>
> Also, when using a mesh topology, why are a bunch of DMA_Controllers
> needed?
>
> -Joseph
>
>
>
> On Fri, Feb 11, 2011 at 3:21 PM, Joseph Pusdesris <[email protected]> wrote:
>
> Hi everyone, I have a few updated questions to ask. This is particularly
> aimed at Brad, but if anyone else knows, I would love some answers.
>
>
>
>
>
>
>
> Why are there n+1 switches rather than just one in the crossbar definition?
>
>
>
> That is to ask, why couldn't this snippet:
>
> ext_links = [ExtLink(ext_node=n, int_node=i)
> for (i, n) in enumerate(nodes)]
> xbar = len(nodes) # node ID for crossbar switch
> int_links = [IntLink(node_a=i, node_b=xbar) for i in range(len(nodes))]
> return Crossbar(ext_links=ext_links, int_links=int_links,
> num_int_nodes=len(nodes)+1)
>
>
>
> Instead be implemented as so?:
>
> ext_links = [ExtLink(ext_node=n, int_node=0)
> for (i, n) in enumerate(nodes)]
> int_links = []
> return Crossbar(ext_links=ext_links, int_links=int_links,
> num_int_nodes=1)
>
>
>
>
>
> What is the status of garnet? I haven't seen much discussion of it on
> either mailing list.
>
>
>
> Is a Bus interconnect possible using either of the ruby network models?
> From what I can tell it's not. The gems-users mailing list seemed to
> agree.
>
>
>
> -Joseph
>
>
>
>
>
>
>
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>
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