Patrick,
The root cause is we do not include the localhost interface by default
for OOB communications.
You should be able to run with
mpirun --mca oob_tcp_if_include lo -np 4 hostname
Cheers,
Gilles
On 1/28/2019 11:02 PM, Patrick Bégou wrote:
Hi,
I fall in a strange problem with OpenMPI 3.1 installed on a CentOS7
laptop. If no network is available I cannot launch a local mpi job on
the laptop:
bash-4.2$ mpirun -np 4 hostname
--------------------------------------------------------------------------
No network interfaces were found for out-of-band communications. We
require
at least one available network for out-of-band messaging.
--------------------------------------------------------------------------
OpenMPI is built localy with
Open MPI: 3.1.3rc1
Open MPI repo revision: v3.1.2-78-gc8e9819
Configure command line: '--prefix=/opt/GCC73/openmpi31x'
'--enable-mpirun-prefix-by-default'
'--disable-dlopen'
'--enable-mca-no-build=openib'
'--without-verbs' '--enable-mpi-cxx'
'--without-slurm' '--enable-mpi-thread-multiple'
I've tested some btl setup found with google but none solve the problem.
bash-4.2$ mpirun -np 4 -mca btl ^tcp hostname
or
bash-4.2$ mpirun -np 4 -mca btl vader,self hostname
Sarting a wifi connection (when it is available):
bash-4.2$ mpirun -np 4 hostname
localhost.localdomain
localhost.localdomain
localhost.localdomain
localhost.localdomain
Any suggestion is welcome
Patrick
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