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Subject: Re: [OMPI devel] openib fragment alignment
From: Joshua Ladd (joshual_at_[hidden])
Date: 2013-02-20 16:39:09


I would hold off, if possible, until I can investigate the issue. I don't, off-hand, know why the 2-byte alignment, although I would suspect it's for performance reasons.

Josh

-----Original Message-----
From: devel-bounces_at_[hidden] [mailto:devel-bounces_at_[hidden]] On Behalf Of Jeff Squyres (jsquyres)
Sent: Wednesday, February 20, 2013 4:35 PM
To: <devel_at_[hidden]>
Subject: [OMPI devel] openib fragment alignment
Importance: High

Arrgh. I think you're going to make me eat my words (http://www.open-mpi.org/community/lists/devel/2013/02/12143.php).

I just recently lost my access to InfiniBand test gear, so I can't test this myself. Hypothetically, it should be fine. But throwing in an untested change literally right before a release without IB vendor say-so really, really gives me pause...

Mellanox?

On Feb 20, 2013, at 4:27 PM, Open MPI <bugs_at_[hidden]> wrote:

> #3519: Move r28083 to v1.6 branch
> -----------------------------------+--------------------------
> Reporter: hjelmn | Owner: hjelmn
> Type: changeset move request | Status: new
> Priority: major | Milestone: Open MPI 1.6
> Version: trunk |
> -----------------------------------+--------------------------
> (In [28083]) btl/openib: don't align fragments on 2 byte boundaries
> (changed to 8)
>
> cmr:v1.6,v1.7
>
> --
> Ticket URL: <https://svn.open-mpi.org/trac/ompi/ticket/3519>
> Open MPI <http://www.open-mpi.org/>
>
> _______________________________________________
> bugs mailing list
> bugs_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/bugs

--
Jeff Squyres
jsquyres_at_[hidden]
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