libomp

LLVM OpenMP runtime library for parallel computing in C/C++/Fortran

brewmacoslinux

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LLVM's OpenMP runtime library

compile C code with OpenMP parallelization support$ gcc -fopenmp -I$(brew --prefix libomp)/include program.c -o program

link against libomp for parallel execution$ clang -fopenmp -L$(brew --prefix libomp)/lib -lomp main.c -o main

set number of threads for parallel OpenMP programs$ OMP_NUM_THREADS=4 ./parallel_program

check OpenMP library path for compiler configuration$ brew --prefix libomp

enable nested parallelism in OpenMP applications$ OMP_NESTED=true OMP_NUM_THREADS=4,2 ./program