Re:Re: [myrinet] Re:Re: Using multiple Myrinet in parallel?

>On Wed, 29 Aug 2001, geoge_zhang wrote:
>>   Our platform is a PC cluster connected with Myrinet. Each PC has four Intel
>>XEON processors running LINUX with 66Bits/66MHZ PCI bus.
>>  I'm not very sure about the characteristics of PCI buses, does our PC cluster
>>platform has 2 or more primary PCI buses, which makes it possible to benifit from
>>using multiple myrinet cards ? Any advice about our idea is appreciated.
>
>
>Run
>	/sbin/lspci -t
>to see the "tree" of PCI slots.
>
>-[00]-+-00.0
>      +-01.0-[01]----00.0
>      +-07.0
>      +-07.1
>      +-07.2
>      +-07.3
>      +-07.4
>      +-07.5
>      \-0d.0
>
>This will help you to know whether you have multiple busses.
>You probably have two busses, one that is 64/66 and another
>"legacy" 5V 64bit/33MHz. What motherboard do you have?
>
  Thank you for you help. Actually, I'm not sure the motherboard of the PCs,
but I'll check it and test it as you said.
  As our large-scale parallel applications requires intensive communication,
we'd like to improve the performance of GM further by using multiple networks.
Since you've invested time in GM for supporting multiple cards in one node, 
could you just emagine the performance results by using two myrinet networks.
Of course, there is incurred overhead for balancing the multiple cards, but
how much the overhead could be ?


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