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Multiprocessing Compilation

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  • December 8, 2021 at 11:11 am #6211
    andy
    Participant

    Hello,

    Quite new to openLB here, and was wondering if there is a
    tutorial on how to compile openLB with openMP.

    I’m able to compile the example tutorial files via the Makefile
    using g++/gcc & cygwin in serial mode, however using PARALLEL_MODE := MPI,
    the compilation is not sucessful, possibly due to the absence of the
    MPIFLAGS component.

    Any tips or suggestions on how to compile it would be appreciated.

    Kind Regards,
    Andy

    December 8, 2021 at 2:01 pm #6212
    Adrian
    Keymaster

    In order to compile in OpenMP mode you only need to set PARALLEL_MODE := OMP in config.mk.

    For MPI you need to set this variable to MPI (as you did) but also change the compiler to the desired MPI wrapper, e.g. mpic++.

    For usage on Windows we recommend the WSL instead of (frequently problematic) Cygwin.

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