> On Jun 22, 2018, at 8:25 PM, r...@open-mpi.org wrote: > > > >> On Jun 22, 2018, at 7:31 PM, Gilles Gouaillardet >> <gilles.gouaillar...@gmail.com <mailto:gilles.gouaillar...@gmail.com>> wrote: >> >> Carlos, >> >> By any chance, could >> >> mpirun—mca oob_tcp_if_exclude 192.168.100.0/24 <http://192.168.100.0/24> ... >> >> work for you ? >> >> Which Open MPI version are you running ? >> >> >> IIRC, subnets are internally translated to interfaces, so that might be an >> issue if >> the translation if made on the first host, and then the interface name is >> sent to the other hosts. > > FWIW: we never send interface names to other hosts - just dot addresses
Should have clarified - when you specify an interface name for the MCA param, then it is the interface name that is transferred as that is the value of the MCA param. However, once we determine our address, we only transfer dot addresses between ourselves > >> >> Cheers, >> >> Gilles >> >> On Saturday, June 23, 2018, carlos aguni <aguni...@gmail.com >> <mailto:aguni...@gmail.com>> wrote: >> Hi all, >> >> I'm trying to run a code on 2 machines that has at least 2 network >> interfaces in it. >> So I have them as described below: >> >> compute01 >> compute02 >> ens3 >> 192.168.100.104/24 <http://192.168.100.104/24> >> 10.0.0.227/24 <http://10.0.0.227/24> >> ens8 >> 10.0.0.228/24 <http://10.0.0.228/24> >> 172.21.1.128/24 <http://172.21.1.128/24> >> ens9 >> 172.21.1.155/24 <http://172.21.1.155/24> >> --- >> >> Issue is. When I execute `mpirun -n 2 -host compute01,compute02 hostname` on >> them what I get is the correct output after a very long delay.. >> >> What I've read so far is that OpenMPI performs a greedy algorithm on each >> interface that timeouts if it doesn't find the desired IP. >> Then I saw here (https://www.open-mpi.org/faq/?category=tcp#tcp-selection >> <https://www.open-mpi.org/faq/?category=tcp#tcp-selection>) that I can run >> commands like: >> `$ mpirun -n 2 --mca oob_tcp_if_include 10.0.0.0/24 <http://10.0.0.0/24> -n >> 2 -host compute01,compute02 hosname` >> But this configuration doesn't reach the other host(s). >> In the end I sometimes I get the same timeout. >> >> So is there a way to let it to use the system's default route? >> >> Regards, >> Carlos. >> _______________________________________________ >> users mailing list >> users@lists.open-mpi.org <mailto:users@lists.open-mpi.org> >> https://lists.open-mpi.org/mailman/listinfo/users
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