On top of XPMEM, try to also force btl/vader with mpirun --mca pml ob1 --mca btl vader,self, ...
On Fri, Mar 5, 2021 at 8:37 AM Nathan Hjelm via users <users@lists.open-mpi.org> wrote: > > I would run the v4.x series and install xpmem if you can > (http://github.com/hjelmn/xpmem). You will need to build with > —with-xpmem=/path/to/xpmem to use xpmem otherwise vader will default to using > CMA. This will provide the best possible performance. > > -Nathan > > On Mar 4, 2021, at 5:55 AM, Raut, S Biplab via users > <users@lists.open-mpi.org> wrote: > > [AMD Official Use Only - Internal Distribution Only] > > It is a single node execution, so it should be using shared memory (vader). > > With Regards, > S. Biplab Raut > > From: Heinz, Michael William <michael.william.he...@cornelisnetworks.com> > Sent: Thursday, March 4, 2021 5:17 PM > To: Open MPI Users <users@lists.open-mpi.org> > Cc: Raut, S Biplab <biplab.r...@amd.com> > Subject: Re: [OMPI users] Stable and performant openMPI version for > Ubuntu20.04 ? > > [CAUTION: External Email] > > What interconnect are you using at run time? That is, are you using Ethernet > or InfiniBand or Omnipath? > > Sent from my iPad > > > > On Mar 4, 2021, at 5:05 AM, Raut, S Biplab via users > <users@lists.open-mpi.org> wrote: > > > [AMD Official Use Only - Internal Distribution Only] > > After downloading a particular openMPI version, let’s say v3.1.1 from > https://download.open-mpi.org/release/open-mpi/v3.1/openmpi-3.1.1.tar.gz , I > follow the below steps. > ./configure --prefix="$INSTALL_DIR" --enable-mpi-fortran --enable-mpi-cxx > --enable-shared=yes --enable-static=yes --enable-mpi1-compatibility > make -j > make install > export PATH=$INSTALL_DIR/bin:$PATH > export LD_LIBRARY_PATH=$INSTALL_DIR/lib:$LD_LIBRARY_PATH > Additionally, I also install libnuma-dev on the machine. > > For all the machines having Ubuntu 18.04 and 19.04, it works correctly and > results in expected performance/GFLOPS. > But, when OS is changed to Ubuntu 20.04, then I start getting the issues as > mentioned in my original/previous mail below. > > With Regards, > S. Biplab Raut > > From: users <users-boun...@lists.open-mpi.org> On Behalf Of John Hearns via > users > Sent: Thursday, March 4, 2021 1:53 PM > To: Open MPI Users <users@lists.open-mpi.org> > Cc: John Hearns <hear...@gmail.com> > Subject: Re: [OMPI users] Stable and performant openMPI version for > Ubuntu20.04 ? > > [CAUTION: External Email] > How are you installing the OpenMPI versions? Are you using packages which are > distributed by the OS? > > It might be worth looking at using Easybuid or Spack > https://docs.easybuild.io/en/latest/Introduction.html > https://spack.readthedocs.io/en/latest/ > > > On Thu, 4 Mar 2021 at 07:35, Raut, S Biplab via users > <users@lists.open-mpi.org> wrote: > > [AMD Official Use Only - Internal Distribution Only] > > Dear Experts, > Until recently, I was using openMPI3.1.1 to run > single node 128 ranks MPI application on Ubuntu18.04 and Ubuntu19.04. > But, now the OS on these machines are upgraded to Ubuntu20.04, and I have > been observing program hangs with openMPI3.1.1 version. > So, I tried with openMPI4.0.5 version – The program ran properly without any > issues but there is a performance regression in my application. > > Can I know the stable openMPI version recommended for Ubuntu20.04 that has no > known regression compared to v3.1.1. > > With Regards, > S. Biplab Raut > >
