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MPIとはMessage Passing Interfaceの略. OpenMPより複雑だが効率の良い並列化ができる?

!Ubuntu LinuxでMPIを使う:
https://qiita.com/pochiMasahiro/items/3c0c2828234b3c6a5a44

$ sudo apt-get install openmpi-doc openmpi-bin libopenmpi-dev

コンパイルはgccではなくmpiccを使う。実行は
$ mpirun -np 4 ./a.out
みたいに。-npでプロセス数を指定。