$ swift run -c release -Xcc -DSWM_USE_OMP -Xcc -I/usr/local/opt/libomp/include/ -Xcc -Xpreprocessor -Xcc -fopenmp -Xlinker -lomp -Xlinker -L/usr/local/opt/libomp/lib/ --triple x86_64-apple-macosx

mt-enabled: true threads: 4 すごい，できた