Hello Howard, To remove potential interactions, I have found that the issue persists without ucx and hcoll support.
Run command: mpirun -np 128 bin/xhpcg Output: -------------------------------------------------------------------------- mpirun was unable to start the specified application as it encountered an error: Error code: 63 Error name: (null) Node: Gen2Node4 when attempting to start process rank 0. -------------------------------------------------------------------------- 128 total processes failed to start It returns this error for any process I initialize with >100 processes per node. I get the same error message for multiple different codes, so the error code is mpi related rather than being program specific. Collin From: Howard Pritchard <hpprit...@gmail.com> Sent: Monday, January 27, 2020 11:20 AM To: Open MPI Users <users@lists.open-mpi.org> Cc: Collin Strassburger <cstrassbur...@bihrle.com> Subject: Re: [OMPI users] OMPI returns error 63 on AMD 7742 when utilizing 100+ processors per node Hello Collen, Could you provide more information about the error. Is there any output from either Open MPI or, maybe, UCX, that could provide more information about the problem you are hitting? Howard Am Mo., 27. Jan. 2020 um 08:38 Uhr schrieb Collin Strassburger via users <users@lists.open-mpi.org<mailto:users@lists.open-mpi.org>>: Hello, I am having difficulty with OpenMPI versions 4.0.2 and 3.1.5. Both of these versions cause the same error (error code 63) when utilizing more than 100 cores on a single node. The processors I am utilizing are AMD Epyc “Rome” 7742s. The OS is CentOS 8.1. I have tried compiling with both the default gcc 8 and locally compiled gcc 9. I have already tried modifying the maximum name field values with no success. My compile options are: ./configure --prefix=${HPCX_HOME}/ompi --with-platform=contrib/platform/mellanox/optimized Any assistance would be appreciated, Collin Collin Strassburger Bihrle Applied Research Inc.
