add install openmpi

Author: ZhikangNiu

src/sys/hpc.md

@@ -10,3 +10,23 @@
 * Labs：
   * CS149 并行计算(该课程与15-418一致) Lab：[[Github](https://github.com/stanford-cs149/asst1)]
   * HPC101 Lab：[[主页](https://www.zjusct.io/HPC101-Labs-2022/)]
+### OpenMPI的安装
+1. OpenMPI的下载及解压: 在[OpenMPI官方主页](https://www-lb.open-mpi.org/software/ompi/v5.0/)找到合适版本的OpenMPI下载并解压
+   ```shell
+   wget https://download.open-mpi.org/release/open-mpi/v5.0/openmpi-5.0.5.tar.gz
+   tar xf openmpi-5.0.5.tar.gz
+   cd openmpi-5.0.5
+   ```
+2. 配置安装路径，编译并安装，安装路径自定义
+   ```shell
+   ./configure --prefix=/usr/local/openmpi
+   make -j $(nproc) all
+   make install
+   ```
+3. 设置环境变量，路径为自己安装的路径
+   ```shell
+   MPI_HOME=/usr/local/openmpi
+   export PATH=$MPI_HOME/bin:$PATH
+   export LD_LIBRARY_PATH=$MPI_HOME/lib:$LD_LIBRARY_PATH
+   export MANPATH=${MPI_HOME}/share/man:$MANPATH
+   ```