OpenMPI with lsdyna mpp

- August 15, 2023 at 3:44 pm
  Wasif Safdar
  Subscriber
  Hello,
  I am trying to use OpenMPI with lsdyna mpp on linux. Here are the details:
  - OpenMPI version 1.10.7
  - lsdyna version Version : mpp s R13
  - Compiler Intel Fortran Compiler 19.0 SSE2
  The problem arises when I try to use $ mprun -np 2 /PathToExecutable/ansys231 pr=dyna i=input.k -lsdynampp, it starts two similar lsdyna processes instead of running lsdynampp on two processors. So I guess it is running mpirun to start the process, and then uses intel mpi to solve the actual simulation on the processors.
  How can I solve this problem?
- August 16, 2023 at 5:25 pm
  
  Ushnish Basu
  Ansys Employee
  
  MPI by definition runs muitiple copies of the specified process, with appropriate communication between them. Whether those processes run on the same machine/node or not depends how the hostfile is specified, e.g. see the questions on hosts here: https://www.open-mpi.org/faq/?category=running
  Also, doing a google search for "mpp bind to core" should take you to a page how to make sure LS-DYNA jobs don't migrate from core to core during a run

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