MPI

Note: Testing has shown that the system runs normally on Ubuntu 20.04, but may hang on Ubuntu 22.04. Please select the Ubuntu 20.04 image. The cause is unknown; if you know the reason, please let us know. Thank you very much!

Installation

# 注意不要安装和使用openmpi包，该包存在问题
apt update && apt-get install mpich

Verification

Simple test:

# 使用mpi执行ls命令，看是否可以输出目录和文件
mpirun -n 2 ls

Compilation and testing:

# 编写test.c文件，内容为：
#include <stdio.h>
#include <mpi.h>
int main (int argc, char** argv) {

        int size, rank;
        MPI_Init(&argc, &argv);

        MPI_Comm_rank(MPI_COMM_WORLD, &rank);
        MPI_Comm_size(MPI_COMM_WORLD, &size);
        printf("size = %d rank = %d\n", size, rank);
        MPI_Finalize();
}

# 编译，将输出a.out可执行文件
mpicc test.c

# 执行，注意使用绝对路径，因为a.out不在PATH环境变量中，这里测试目录是/root
mpirun -n 1 /root/a.out

Note: Testing has shown that the system runs normally on Ubuntu 20.04, but may hang on Ubuntu 22.04. Please select the Ubuntu 20.04 image. The cause is unknown; if you know the reason, please let us know. Thank you very much!

Installation

# 注意不要安装和使用openmpi包，该包存在问题
apt update && apt-get install mpich

Verification

Simple test:

# 使用mpi执行ls命令，看是否可以输出目录和文件
mpirun -n 2 ls

Compilation and testing:

# 编写test.c文件，内容为：
#include <stdio.h>
#include <mpi.h>
int main (int argc, char** argv) {

        int size, rank;
        MPI_Init(&argc, &argv);

        MPI_Comm_rank(MPI_COMM_WORLD, &rank);
        MPI_Comm_size(MPI_COMM_WORLD, &size);
        printf("size = %d rank = %d\n", size, rank);
        MPI_Finalize();
}

# 编译，将输出a.out可执行文件
mpicc test.c

# 执行，注意使用绝对路径，因为a.out不在PATH环境变量中，这里测试目录是/root
mpirun -n 1 /root/a.out