[OMPI users] How to get rid of OpenMPI warning: unable to find any relevant network interfaces

[Susan A. Schwarz]

I am using OpenMPI 1.10.1 built with Intel compilers 16.0.3 on Centos 6.7. Our cluster has some cells where the nodes have infiniband and some cell with 10GB IP. I am hoping that I can build just one version of OpenMPI that can run on both infiniband and IP cells and not get any network-related warnings. I configured and built OpenMPI on a node with infiniband as follows:


./configure CXX=icpc CC=icc FC=ifort --prefix=/opt/openmpi/1.10.1-intel16.0 \

--enable-mpirun-prefix-by-default --with-threads --enable-mpi-thread-multiple \

--with-tm=/opt/torque/active --with-verbs=/usr --with-verbs-libdir=/usr/lib64


We are using OFED 3.2 that is part of the Centos distribution. When I run a program built with this version of OpenMPI and configured as described above on a cell with infiniband, the program runs without any warnings or errors. However, when I run on an IP-based cell, I get the following warning:


----------------------------------------------------------

A high-performance Open MPI point-to-point messaging module
was unable to find any relevant network interfaces:
Module: OpenFabrics (openib)
Host: k07

Another transport will be used instead, although this may result in
lower performance.
—————————————————————————————————————————
The program runs correctly but I am wondering if there is a way to get rid of the warning. I am aware of the MCA btl arguments that can be used with mpirun to specify ib or ip but I was hoping I didn’t have to burden my users with those details. Is there a way to configure OpenMPI to run on either IB or IP without warnings.

Thank you,
Susan

Susan Schwarz
Research Software Engineer
Research Computing
Dartmouth College
Hanover, NH 03755

[Jeff Squyres (jsquyres)]

Susan --

Try setting

--mca btl_base_warn_component_unused 0

That should make the warning go away (shame on us for not putting that in the warning message itself -- doh!).

If that works for you, you can put "btl_base_warn_component_used = 0" in $prefix/etc/openmpi-mca-params.conf (i.e., your side-wide configuration).

Post by Susan A. Schwarz
./configure CXX=icpc CC=icc FC=ifort --prefix=/opt/openmpi/1.10.1-intel16.0 \
--enable-mpirun-prefix-by-default --with-threads --enable-mpi-thread-multiple \
--with-tm=/opt/torque/active --with-verbs=/usr --with-verbs-libdir=/usr/lib64
----------------------------------------------------------
A high-performance Open MPI point-to-point messaging module
Module: OpenFabrics (openib)
Host: k07
Another transport will be used instead, although this may result in
lower performance.
—————————————————————————————————————————
The program runs correctly but I am wondering if there is a way to get rid of the warning. I am aware of the MCA btl arguments that can be used with mpirun to specify ib or ip but I was hoping I didn’t have to burden my users with those details. Is there a way to configure OpenMPI to run on either IB or IP without warnings.
Thank you,
Susan
Susan Schwarz
Research Software Engineer
Research Computing
Dartmouth College
Hanover, NH 03755
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--
Jeff Squyres
***@cisco.com

[Susan A. Schwarz]

Hi Jeff,

Thanks so much. Your suggestion eliminated the warning. I set
btl_base_warn_component_unused = 0 in the configuration file.

Susan

On 2/9/17, 6:46 PM, "users on behalf of Jeff Squyres (jsquyres)"

Post by Jeff Squyres (jsquyres)
Susan --
Try setting
--mca btl_base_warn_component_unused 0
That should make the warning go away (shame on us for not putting that in
the warning message itself -- doh!).
If that works for you, you can put "btl_base_warn_component_used = 0" in
$prefix/etc/openmpi-mca-params.conf (i.e., your side-wide configuration).

On Feb 9, 2017, at 3:30 PM, Susan A. Schwarz
I am using OpenMPI 1.10.1 built with Intel compilers 16.0.3 on Centos
6.7. Our cluster has some cells where the nodes have infiniband and some
cell with 10GB IP. I am hoping that I can build just one version of
OpenMPI that can run on both infiniband and IP cells and not get any
network-related warnings. I configured and built OpenMPI on a node with
./configure CXX=icpc CC=icc FC=ifort
--prefix=/opt/openmpi/1.10.1-intel16.0 \
--enable-mpirun-prefix-by-default --with-threads
--enable-mpi-thread-multiple \
--with-tm=/opt/torque/active --with-verbs=/usr
--with-verbs-libdir=/usr/lib64
We are using OFED 3.2 that is part of the Centos distribution. When I
run a program built with this version of OpenMPI and configured as
described above on a cell with infiniband, the program runs without any
warnings or errors. However, when I run on an IP-based cell, I get the
----------------------------------------------------------
A high-performance Open MPI point-to-point messaging module
Module: OpenFabrics (openib)
Host: k07
Another transport will be used instead, although this may result in
lower performance.
‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹‹
The program runs correctly but I am wondering if there is a way to get
rid of the warning. I am aware of the MCA btl arguments that can be
used with mpirun to specify ib or ip but I was hoping I didn¹t have to
burden my users with those details. Is there a way to configure OpenMPI
to run on either IB or IP without warnings.
Thank you,
Susan
Susan Schwarz
Research Software Engineer
Research Computing
Dartmouth College
Hanover, NH 03755
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