Centos7 MPI Java 环境准备

Centos7 MPI java 环境准备

1. 如果没有java环境安装java环境。
   yum install -y java-1.8.0-openjdk.x86_64 java-1.8.0-openjdk-devel.x86_64

2. 安装一些必须的包
   yum update
yum install wget -y

3. 下载openmpi安装包
   wget https://download.open-mpi.org/release/open-mpi/v4.0/openmpi-4.0.5.tar.gz

4. 解压openmpi到/openmpi-install目录下
   mkdir /openmpi-install
tar -zxvf openmpi-4.0.5 /openmpi-install

5. 进入安装目录
   cd /openmpi-install

6. 编译安装openmpi (编译链接MPI java源程序)
   ./configure --prefix=/openmpi --enable-mpi-java
make && make install

7. 配置
   vim ~/.bashrc

8. 添加 (:wq退出vim)
   export OPENMPI=/openmpi
export PATH=$OPENMPI/bin:$PATH

9. 令配置生效
   source ~/.bashrc

10. 检验
    which mpijavac

11. 代码检验

    • 示例代码

    import mpi.MPI;
    public class OpenMpiExample {
    
        public static void main(String[] args) throws Exception{
            MPI.Init(args);
            int myrank = MPI.COMM_WORLD.getRank();
            int size = MPI.COMM_WORLD.getSize();
            if(myrank == 0){
                System.out.println("hello world from master - " + myrank + "of" + size);
            }else {
                System.out.println("hello world from salve - " + myrank + "of" + size);
            }
            MPI.Finalize();
    
        }
    }
    

12. 运行命令
    mpijavac OpenMpiExample.java
mpirun -np 2 java OpenMpiExample

结果：

hello world from salve - 0 of 2;
hello world from salve - 1 of 2;

[参考文献]
https://www.mpich.org/static/downloads/3.2.1/mpich-3.2.1-installguide.pdf
https://www.open-mpi.org/doc/current/