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
