Multiprocessing Compilation

[andy]

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

[Adrian]

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.

[Author]

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