spark 与 mpi 关系
https://www.dursi.ca/post/hpc-is-dying-and-mpi-is-killing-it.html：这算是对MPI的重炮轰击了！
https://www.dursi.ca/post/in-praise-of-mpi-collectives-and-mpi-io.html
https://stackoverflow.com/questions/10237443/mpi-vs-gpu-vs-hadoop-what-are-the-major-difference-between-these-three-parallel
https://www.reddit.com/r/bigdata/comments/4zguce/whats_the_difference_between_spark_and_mpi/