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Subject: Re: [OMPI users] openmpi, 1.6.3, mlx4_core, log_num_mtt and Debian/vanilla kernel
From: Stefan Friedel (stefan.friedel_at_[hidden])
Date: 2013-02-21 06:35:53


On Thu, Feb 21, 2013 at 12:23:14PM +0100, Paul Kapinos wrote:
>The MTT-Parameter mess is well-known and the good solution is to set
>the MTT parameter high. In other case you never know what you will
>get - your application may hang, block the IB interface, run bit
>slower, run very slow...
>
>http://www.open-mpi.org/faq/?category=openfabrics#ib-low-reg-mem

As I wrote: I'm aware of this FAQ entries -but: you can't set the log_num_mtt
parameter if you're using a Debian/vanilla kernel: the mlx4_core-module
does not offer this parameter.

MfG/Sincerely,
Stefan Friedel

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