Alberto, Are you saying the program hang even without jumbo frame (aka 1500 MTU) ? At first, make sure there is no firewall running, and then you can try mpirun --mca btl tcp,vader,self --mca oob_tcp_if_include eth0 --mca btl_tcp_if_include eth0 ... (Replace eth0 with the interface name you want to use)
Cheers, Gilles Alberto Ortiz <alberto.orti...@gmail.com> wrote: >I am using version 1.10.6 on archlinux. > >The option I should pass to mpirun should then be "-mca btl_tcp_mtu 13000"? >Just to be sure. > >Thank you, > >Alberto > > >El 5 may. 2017 16:26, "r...@open-mpi.org" <r...@open-mpi.org> escribió: > >If you are looking to use TCP packets, then you want to set the send/recv >buffer size in the TCP btl, not the openib one, yes? > >Also, what version of OMPI are you using? > >> On May 5, 2017, at 7:16 AM, Alberto Ortiz <alberto.orti...@gmail.com> wrote: >> >> Hi, >> I have a program running with openMPI over a network using a gigabit switch. >> This switch supports jumbo frames up to 13.000 bytes, so, in order to test >> and see if it would be faster communicating with this frame lengths, I am >> trying to use them with my program. I have set the MTU in each node to be >> 13.000 but when running the program it doesn't even initiate, it gets >> blocked. I have tried different lengths from 1.500 up to 13.000 but it >> doesn't work with any length. >> >> I have searched and only found that I have to set OMPI with "-mca >> btl_openib_ib_mtu 13000" or the length to be used, but I don't seem to get >> it working. >> >> Which are the steps to get OMPI to use larger TCP packets length? Is it >> possible to reach 13000 bytes instead of the standard 1500? >> >> Thank yo in advance, >> Alberto >> _______________________________________________ >> users mailing list >> users@lists.open-mpi.org >> https://rfd.newmexicoconsortium.org/mailman/listinfo/users > >_______________________________________________ >users mailing list >users@lists.open-mpi.org >https://rfd.newmexicoconsortium.org/mailman/listinfo/users >
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