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Subject: [OMPI devel] Multi-rail on openib
From: Mouhamed Gueye (mouhamed.gueye_at_[hidden])
Date: 2009-06-05 09:48:05


Hi all,

I am working on multi-rail IB and I was wondering how connections are
established between ports. I have two hosts, each with 2 ports on a
same IB card, connected to the same switch.

My question is : how ports are connected between them ? Is there a queue
pair between all ports or only between ports of the same number (for
example, Host A => port 1 <===> port 1 <= Host B and Host A => port 2
<===> port 2 <= Host B or maybe Host A => port 1 <===> port 2 <= Host B
and Host A => port 2 <===> port 1 <= Host B) ? Is it possible to force
the connection scheme on the openib btl ?

Thanks

Mouhamed