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Subject: [OMPI devel] TCP BTL routability (was: ticket #972)
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-07-29 15:25:00


On Jul 29, 2008, at 3:20 PM, Terry Dontje wrote:

> So, we've pinged ticket #972 several times to see if the issue it
> covers has been fixed and have not really gotten a response in the
> last few months. While talking with Jeff about a recent thread on
> the users list about this issue he has found the code in
> btl_tcp_proc.c that determines whether the tcp btl can be used has
> changed significantly between 1.2 and 1.3. So a question is has
> these changes changed the rules of whether connections between two
> nodes should use the tcp btl as described on the FAQ? If so we
> should update the FAQ.

For reference, the FAQ entry is here:

     http://www.open-mpi.org/faq/?category=tcp#tcp-routability

It looks like we now *always* assume that two TCP peers are routable.
The code in question is in btl_tcp_proc.c with the loop starting at
line 413.

-- 
Jeff Squyres
Cisco Systems