Hi Gilles, localhost is available in the state where the problem occurs. I discover suddently this mpi trouble yesterday as I was working in the train... otherwise I was always connected to the net at home (wifi) or at the laboratory (wired)....
bash-4.2$ ifconfig enp0s31f6: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether e4:b9:7a:01:ec:11 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 16 memory 0xef200000-ef220000 *lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536** ** inet 127.0.0.1 netmask 255.0.0.0** ** inet6 ::1 prefixlen 128 scopeid 0x10<host>** ** loop txqueuelen 1000 (Boucle locale)** ** RX packets 525941 bytes 859209091 (819.4 MiB)** ** RX errors 0 dropped 0 overruns 0 frame 0** ** TX packets 525941 bytes 859209091 (819.4 MiB)** ** TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0** * virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255 ether 52:54:00:2d:6f:8e txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 wlp2s0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether 76:f4:76:61:12:28 txqueuelen 1000 (Ethernet) RX packets 941959 bytes 1168504942 (1.0 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 491366 bytes 63144705 (60.2 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Le 28/01/2019 à 15:17, Gilles Gouaillardet a écrit : > Patrick, > > Does “no network is available” means the lo interface (localhost > 127.0.0.1) is not even available ? > > Cheers, > > Gilles > > On Monday, January 28, 2019, Patrick Bégou > <patrick.be...@legi.grenoble-inp.fr > <mailto:patrick.be...@legi.grenoble-inp.fr>> 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 > > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users
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