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Subject: Re: [OMPI users] Question about '--mca btl tcp,self'
From: Jeff Squyres (jsquyres) (jsquyres_at_[hidden])
Date: 2014-03-14 10:16:34

On Mar 14, 2014, at 10:11 AM, Ralph Castain <rhc_at_[hidden]> wrote:

>> 1. If specified '--mca btl tcp,self', which interface application will run on, use GigE adaper OR use the OpenFabrics interface in IP over IB mode (just like a high performance GigE adapter) ?
> Both - ip over ib looks just like an Ethernet adaptor

To be clear: the TCP BTL will use all TCP interfaces (regardless of underlying physical transport). Your GigE adapter and your IP adapter both present IP interfaces to the OS, and both support TCP. So the TCP BTL will use them, because it just sees the TCP/IP interfaces.

Jeff Squyres
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