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On 10/26/2017 09:58 AM, Sebastian Eastham wrote:
> As it happens, you are exactly right, and it turns out this was a
> case of "error exists between keyboard and chair". In particular I
> wanted to thank John Hearns for pointing out the difference
[slurm-dev] RE: Selecting a network interface with srun
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I think this is probably the best advice. I've personally never run into a set
of circumstances where MPI didn't pick the right interface where there wasn't a
major misconfiguration
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I think this is probably the best advice. I've personally never run
into a set of circumstances where MPI didn't pick the right interface
where there wasn't a major misconfiguration (you'd of course want to
test that on your system), but users might w
Ralph, indeed.
As I have said before: Finally, my one piece of advice to everyone
managing batch systems. It is a name resolution problem. No, really it is.
Even if your cluster catches fire, the real reason that your jobs are not
being submitted is that the DNS resolver is burning and the sch
Good points. I would also caution against renaming nodes using interfaces. This
frequently causes failure of 3rd party software packages that compare the
return value of “hostname” to the list of allocated nodes for optimization or
placement purposes - e.g., mpirun! A quick grep of the mailing l
When using “mpirun” we can specify “-iface ib0”this is true, and the
exact syntax depends on your MPI of choice, as noted above.
However, don't get confused between IPOIB and Infiniband itself. IPOIB
is of course sending IP traffic over Infiniband.
An Infiniband network can perfectly happil
Hi Sebastian,
Another solution could be to change the configuration of nodes in slurm.conf,
making use of NodeName and NodeHostname (and NodeAddr if needed) :
“
NodeName
Name that Slurm uses to refer to a node[...]. Typically this would be the
string that "/bin/hostname -s" returns.[...]It may
fwiw, with Open MPI, ib0 can be selected with
export OMPI_MCA_btl_openib_if_include=ib0
assuming slurm was not configured not to export this environment variable
Gilles
On 10/25/2017 12:55 PM, Paul Hargrove wrote:
Re: [slurm-dev] Re: Selecting a network interface with srun
The "-ifac
The "-iface ib0" syntax is used by the hydra launcher if MPICH and its
derivatives such as MVAPICH.
I suggest
http://wiki.mcs.anl.gov/mpich2/index.php/Using_the_Hydra_Process_Manager as
a starting point.
-Paul
On Tue, Oct 24, 2017 at 8:19 PM, r...@open-mpi.org wrote:
> “ibface” isn’t an OpenMPI
“ibface” isn’t an OpenMPI cmd line option, so I suspect you are using something
other than OpenMPI. For OMPI, you could specify the interface via MCA param in
the environment or default MCA parameter file. Most MPI implementations have a
similar mechanism - you might check your documentation.
Hi,
I believe that if you are using OpenMPI you can declare the interface. By
default it should select the fastest interface on the system. This FAQ may
be of help. https://www.open-mpi.org/faq/?category=tcp
If I have misunderstood the problem I apologize. best of luck!
Doug
On Tue, Oct 24,
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