主要参考：
基础教程：https://mpitutorial.com/tutorials
进阶教程：https://enccs.github.io/intermediate-mpi
基础教程
安装运行：
- open mpi安装
- run mpi program over a cluster 在集群上跑mpi程序
- mpi overall
- 这篇必看，摘自
man mpirunmpirun
point-to-point：
- mpi block send and receive
- mpi dynamic receive (dynamic means buffer size)
- mpi Point-to-Point Communication example: random walk
collective：
- MPI Broadcast and Collective Communication
- MPI Scatter, Gather, and Allgather
- collective call example: Performing Parallel Rank with MPI
- MPI Reduce and Allreduce
