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Subject: Re: [OMPI users] Strange OpenMPI messages
From: Gustavo Correa (gus_at_[hidden])
Date: 2012-02-14 16:52:17


Hi Tohiko

OpenFabrics network a.k.a. Infiniband a.k.a. IB.
To check if the compute nodes have IB interfaces, try:

lspci [and search the output for Infinband]

To see if the IB interface is configured try:

ifconfig -a [and search the output for ib0, ib1, or similar]

To check if the OFED module is up try:

'service openibd status'

As an alternative, you could also try to run your program over Ethernet, avoiding Infinband,
in case you don't have IB or if somehow it is broken.
It is slower than Infiniband, though.

Try something like this:

mpiexec -mca btl tcp,sm,self -np 4 ./my_mpi_program

I hope this helps,
Gus Correa

On Feb 14, 2012, at 4:02 PM, Tohiko Looka wrote:

> Sorry for the noob question, but how do I check my network type and if OFED service is running correctly or not? And how do I run it
>
> Thank you,
>
> On Tue, Feb 14, 2012 at 2:14 PM, Jeff Squyres <jsquyres_at_[hidden]> wrote:
> Do you have an OpenFabrics-based network? (e.g., InfiniBand or iWarp)
>
> If so, this error message usually means that OFED is either installed incorrectly, or is not running properly (e.g., its services didn't get started properly upon boot).
>
> If you don't have an OpenFabrics-based network, then it usually means that you have OpenFabrics services running when you really shouldn't (because you don't have any OpenFabrics-based devices).
>
>
> On Feb 14, 2012, at 4:48 AM, Tohiko Looka wrote:
>
> > Greetings,
> >
> > Until today I was running my openmpi applications with no errors/warnings
> > Today I restarted my computer (possibly after an automatic openmpi update) and got these warnings when
> > running my program
> > [tohiko_at_kw12614 1d]$ mpirun -x LD_LIBRARY_PATH -hostfile hosts -np 10 hello
> > librdmacm: couldn't read ABI version.
> > librdmacm: assuming: 4
> > CMA: unable to get RDMA device list
> > --------------------------------------------------------------------------
> > [[21652,1],0]: A high-performance Open MPI point-to-point messaging module
> > was unable to find any relevant network interfaces:
> >
> > Module: OpenFabrics (openib)
> > Host: kw12614
> >
> > Another transport will be used instead, although this may result in
> > lower performance.
> > --------------------------------------------------------------------------
> > [kw12614:03195] 10 more processes have sent help message help-mpi-btl-base.txt / btl:no-nics
> > [kw12614:03195] Set MCA parameter "orte_base_help_aggregate" to 0 to see all help / error messages
> >
> >
> > Is this normal? And how come it happened now?
> > -- Tohiko
> > _______________________________________________
> > users mailing list
> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users
>
>
> --
> Jeff Squyres
> jsquyres_at_[hidden]
> For corporate legal information go to:
> http://www.cisco.com/web/about/doing_business/legal/cri/
>
>
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