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What is hybrid message passing?

User: "Angel_Ggonzalez"
Angel_Ggonzalez
Altair Community Member

Good day to all,

Someone could tell me please what is Hybrid message passing of the Hypermesh CFD solver and in what cases should I use it? Also if it could help to reduce computational running times.

Captura de pantalla 2025-05-26 140448.png

Thanks in advance.

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    User: "acupro"
    acupro
    Altair Employee

    Let's say you have a compute node / machine with 20 physical cores - and you specify to run with 20 processors/cores.

    By default AcuSolve will query the machine and determine it has 20 cores - and set 'number of threads' = 20. This would be pure openmp - where it's a single process with 20 threads.

    Pure mpi would be where you specify 'number of threads' = 1. There you would have 20 processes, with 1 thread each.

    Hybrid would be a mix. So let's say you specify 'number of threads' = 5. There you would have 4 mpi processes, with 5 threads each using openmp (to get to the same total of 20 cores used).

    It's explained a little on the following page - if you look for num_threads

    https://help.altair.com/hwcfdsolvers/acusolve/topics/acusolve/solver_programs_acurun.htm

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