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Subject: Re: [OMPI devel] Multi-Rail and Open IB BTL
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2007-11-09 13:15:21


Don --

Are you asking what *does* it do, or what *should* a BTL do?

On Nov 9, 2007, at 1:09 PM, Don Kerr wrote:

> Gleb,
>
> Another question. What about the case of one node with 2 ports and
> one
> node with one port. Does the open ib btl allow the side with 2
> ports to
> establish two endpoints to the single remote port?
>
> -DON
>
> Gleb Natapov wrote:
>
>> On Thu, Nov 01, 2007 at 11:15:21AM -0400, Don Kerr wrote:
>>
>>
>>> How would the openib btl handle the following scenario:
>>> Two nodes, each with two ports, all ports are on the same subnet
>>> and switch.
>>>
>>> Would striping occur over 4 connections or 2?
>>>
>>>
>> Only two connections will be created.
>>
>>
>>
>>> If 2 is it equal distribution or are both local ports connected to
>>> the
>>> same remote port?
>>>
>>>
>>>
>> Equal distribution.
>>
>> --
>> Gleb.
>> _______________________________________________
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>> devel_at_[hidden]
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>>
>>
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-- 
Jeff Squyres
Cisco Systems