From: Jeff Squyres (jsquyres) <jsquy...@cisco.com>
To: "t...@riseup.net" <t...@riseup.net>; Open MPI User's List
<us...@open-mpi.org>
Sent: Monday, 9 March 2015, 18:53:17
Subject: Re: [OMPI users] how to compile without ib support
On Mar 9, 2015, at 12:19 PM, Tus <t...@riseup.net> wrote:
>
> I configured and installed 1.8.4 on my system. I was getting openfabric
> erros and started to specify -mca btl ^openib which is working but very
> slow.
>
> I would like to complile again excluding openfabric or ib support. I do
> have a 10GbE fast network in addition to 1G net. What flags are need to
> ignore ib support and how can I verify/force openmpi to use my 10GbE net?
You have several options:
1. If you did a default Open MPI install, you can simply rm the
"mca_btl_openib.so" plugin that was installed under $prefix/lib/openmpi. Open
MPI then won't know that that plugin exists, and it won't try to use
OpenFabrics-based devices.
2. You can set a system-wide MCA parameter to ignore the openib BTL. That way,
you don't have to type it on the mpirun command line every time.
3. You can rebuild Open MPI with the --without-verbs configure command line
switch. This will ultimately have the same effect as #1 (i.e., the openib
plugin won't be in the installation tree).
As for using your 10G, I assume you mean over TCP sockets, right?
If so, you can use --mca btl_tcp_if_include <NAME_OF_10G_DEVICE> or
<CIDR_OF_10G_NETWORK>. E.g.:
mpirun --mca btl_tcp_if_include eth1 ...
mpirun --mca btl_tcp_if_include 10.20.30.0/24 ...
--
Jeff Squyres
jsquy...@cisco.com
For corporate legal information go to:
http://www.cisco.com/web/about/doing_business/legal/cri/
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