"ompi_info --param btl tcp -l 9" will give you all the TCP options. Unfortunately, OMPI does not support programatically changing the value of the MTU.
George. PS: We would be happy to receive contributions from the community. On Fri, May 5, 2017 at 10:29 AM, 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 >> > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://rfd.newmexicoconsortium.org/mailman/listinfo/users >
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